I'm also giving it a try now. I've set a new Colemak DH united layout in PKL and also programmed a new layer in my Planck to see how it works with ortholinear keyboard. What I've tried so far is to type some words containing M using a typing tutor on the standard keyboard. What to say, when typing "M" word a lot one by one using Hm mod, I have the same feeling in right hand as when I'm using standard Colemak with its endless "he" stretch. That is not happened in Hkm mod. Regarding the "K", I like "ck" and "king" more now. Is "ck" is more frequent than "cm"? What is good that "ke" is definitely less frequent than "me".

Steve, so what do you think about the new layout? I'm using it for two days now. Overall it looks good. What I do like is the new "ck", in the DvbgHm I'm messing it with "ch" often. "ook" is also good. What I not so like is "mu" and "my". While they are not ideal in Colemak, but I feel them better when M is in the middle row.

I've had some typing bouts at nearly normal speed already. I think this is going smoothly. But indeed, the rarest keys will give you most trouble. Since I'm already used to K-in-the-middle, for me the biggest hassle now is V and it's getting whipped into submission as we speak/type.

I don't feel that MY is a problem at all, somehow. My oh my. For MU, you can use the ring finger on U if it bothers you. Seems I do that intuitively already. There's no easy fix for LM I think (I use middle finger on L but it isn't super comfy), but I think it should be fairly rare. So I'm quite caLM about it, not a quaLM in my baLMy head nosirree. ;-)

The odd Copy/Paste error still can't be helped. But it's better than I feared.

I've updated my USB-2-USB files. Going to test them out soon and then push to GitHub.

I'm proceeding the hell out of it, yes! I've updated most of the forum topics, the USB-2-USB TMK code and I had a gander at PKL yesterday. Too bad with all those Tarmak help images that are a pain to replace...! Maybe I'll update XKB first, as it's more low-hanging fruit I believe.

I'm typing away at nearly my old speeds, and it feels comfy and nice. The occasional copy-paste error still trips me up, but it's not bad. What happens is I press Extend-D which is the mouse button, then get confused and paste into that new location before I undo. Thank the chaos gods for allowing Undo to exist! ^_^

I'm keeping Steve's original mod under the name Curl(DHm for matrix boards) or similar, and mostly pushing my original mod to the back. It gets a mention but not a front page placement nor easy implementation anymore. So anyone who still wants it will have to tweak a little code, but it should still be quite doable. For PKL, I guess I'll keep all those nice images I've already made, but I'll push my old mod to the back so the default is what meets the newcomer.

I'm hoping that Steve finds the time and inspiration to update his colemakmods pages soon!

Did you like the new mod on your Planck matrix board? Or do you feel that matrix boards still need M-in-the-middle?

    My Unicomp Buckling Spring board, rolling with the times

Best of luck with your K! As discussed before, it's a double whammy on the demoted keys, as they go to worse positions and are rare so you get less practice with them. But it'll sort itself soon enough, I'm sure! I feel almost there on my part, now. I changed more keys than you in this bout, but my changes were somewhat more common keys and I've put in some solid Amphetype practice to hammer the point in.

I also hope you'll revisit your analysis tool where you gave a punishing weight of 2.6 for the down-out positions! I hope we can agree that they aren't really that bad. Off the top of my arse, maybe 2.2 or thereabouts? ;-) But of course, that's quite subjective either way.

I do not use my Planck as a daily driver, but today I typed on it for the entire day (and I'm using it now). My opinion that M in the middle of the bottom row is fine. I do not think that M in the home row gives some special benefits for the ortholinear layout. I still getting used to M at the bottom and almost adopted, I do not feel any terrible discomfort because of that change. It needs to take into consideration that I've been re-learned to the DH mod already. Straight from Colemak that should be easier to adapt. It feels the same as V as left side, which is also a little different feeling at ortholinear keyboard in its shifted position than on the staggered one. M in the home row was not ideal as well, mostly because of ME in my opinion, that could be felt quite obvious when typing a lot of M words. You guys have moved H from that position for the same reason! Than KE is obviously less frequent than HE or ME. Now we have strange bigram KN though, but it was on the same finger anyway, and MN was not better as well.
Then, regarding the ErgoDox (which I also have, but using even less often than Planck), its design allows to access V and M with thumbs. That may be used for alternative fingering, MY will not be a problem any more.

My major challenge with Planck is actually not typing, but navigation. I used to use navigation cluster on the standard keyboard. But now I seemed to find solution. I have navigation layer which closely resembled to DreymaRs Extend. I have arrows, home end, page up down, ctrl shift at the same positions as well as cut copy paste (paste is assigned to both D and V). And it is activated with holding CapsLock key. That was actually the main reason why I'm not using Extend on the standard keyboard because I get used to use CapsLock for Backspace. But QMK which is driving Planck allowed me to make CapsLock a dual purpose key, it is Backspace when tapped and Navigation layer when held.

It works like a charm. No erroneous deletions at all. Actually when I compare the dual-role backspace to the regular using Switch Hitter, the press down time for dual-role key is around 5 ms, while for the regular key it is around 120ms. Holding down for dual key is not detected by Switch Hitter at all. What is interesting, for PKL processed keys the press down time is also around the 5 ms for all keys.

46:38.0020 Backspace (0x08, BIOS 0x0E) DOWN
46:38.0024 Backspace (0x08, BIOS 0x0E) UP -> 5ms
46:38.0768 Backspace (0x08, BIOS 0x0E) DOWN
46:38.0879 Backspace (0x08, BIOS 0x0E) UP -> 111ms 

I will definitely do that for ErgoDox. Regarding the Planck, I have 5 thumb keys, and one of them is toggle Navigation key (other 4 are Raise, Lower, Space, and one-click Shift). The CapsLock one is do doing quick job in Navigation.
I'm trying to unify my Planck and ErgoDox layouts, but this is not an easy task, as the absence of number's row affects the Planck's layout design a lot.

Excellent work, Steve! Two thumb keys up!

What about this page though, could that get a slight update too? ^_^

http://colemakmods.github.io/ergonomic-mods/dh.html

It's linked to in your forum signature. I don't know if that's necessary anymore, since you also have the updated DH-mod page there.

I think that we should for the most part relegate at least my old mod to the History section. Yours... I'm calling it Curl(DHm) now and including options for it, but I'd like to keep it in the back like you did on your main DH-mod page. It's very interesting that ckofy didn't see the need for it on matrix boards! Other matrix users may feel differently about that of course, we'll see.

These Unicomp boards are essentially the same as IBM Model M; thus, you may use IBM-type buckling spring key tops. Some have a cap that clicks onto the keytop itself, while some of my keys are in one piece for some reason. All the keys have the same shape, so they're freely interchangeable.

I just typed a standard text in Amphetype at 75 WPM using Colemak-Curl(DH) (or rather, the updated Colemak-CAW)! I think my average speeds are still down from pre-remodding by maybe 5 WPM, but I'm closing in on my old speeds every day I feel, and typing is fun and effortless now. I'm really liking the feel of the mod!

The only trouble is with words like 'him'. It's no big deal, but it's not comfy because of the index fingers gymnastics involved. No layout can be perfect for absolutely all words! ^_^

That's good to hear! 

With your ErgoDox, have gone for the M-in-the-home-row option, or is it in the bottom corner position? The M is probably the most tricky issue, esp for orthogonal boards, how are you finding it?