Grats on that super fast improvement, you impress as always!  ∩(◕‿◕｡)∩～♪

In theory, Colemak-DH should be even nicer for a row-staggered board than a matrix one. Your main issue is with the ANSI Angle-Z mod that usually goes with ANSI Colemak-DH. We ISO boarders have a much more pleasant ride. I've thought that the Angle-Z mod was worth sacrificing the Z position for the benefit of a straight wrist, but in your case you're coming from the Angle-Cheat so your benefit will primarily be a little lower SFB frequency from having the SC bigram as Shai intended instead of the roughly twice as common CT bigram using Angle-Cheat.

People who have a thumb key to spare or a programmable keyboard might just as well choose the Fat-Z angle mod if they can reclaim the left Shift somehow. But I don't think that's so safe on a standard keyboard with standard tools. Not sure what's best for you then? It'll be interesting to see what you think further on.

One of Shai's worries concerning the Angle mod has been the slightly worse stretch to the G (Cmk-DH B) position, how do you feel about that? I don't mind but I'm not that fast.

By the way, have you checked out MonkeyType yet? It's my fave typing site now:
https://monkeytype.com/

If you mean the G being worse than B in DH, they feel roughly equal to me, but I'm not sure if I understood you right. I did try monkeytype today. I like the design a lot more than 10ff! Feels a lot calmer and the customisability is amazing.

Yeah, while it feels comfortable at first, it'd be better to put some effort into balancing the workload between the middle and index fingers just for the CT bigram alone. You could say it's the same like people finding qwerty comfortable just because they're used to it :P

That is one big reason, the other one being having to memorize 3 locations; every time I'm about to use D, V, or Z, my brain sometimes "retrieves" the wrong spot from its memory and hits V instead of D for example. It would be significantly easier if my brain didn't have to worry about 3 spots on the same row. This is however related to the physical layout of the kb, not Mod-DH, although it exaggerates the effect because I don't quite have the same rock-solid muscle memory as on vanilla yet.

A minor update 3 days in: already in the 140-160wpm range on simple word lists like the ones from monkeytype and 10ff and 110-130 on TyperA! I hardly practised the past 2 days, maybe 20 minutes total spent typing on a site. Most of the improvement is happening in the background naturally. I've noticed that I struggle the most with two keys that didn't move, V and K, which is funny. For V, I usually end up hitting D, and for K, I end up hitting H. I assume it's because I memorized the layout by relative distances between keys, and now I have to rebuild that sense.

I believe that it's possible to regain most if not all of your vanilla Colemak speed within about 20 hours of proper practice. I doubt I'll be able to reach my previous top speeds of 220+ on simple word lists to compare just how big the difference in ergonomics is, but I believe I can get back to 180wpm on tougher lists soon, which should be enough to form an unbiased opinion and write about my learning experience.

This supports the hypothesis that it's the most rarely used keys that you don't think about, that end up being the hardest to adjust to. V and K are rare, and since they don't actually move in the mod they receive little attention. By contrast, D and H fall into place very rapidly. When switching from Colemak-DHk to DHm recently, I had little trouble with the M but K kept tripping me up for a while. And yes, I seem to remember making a little more V errors after the switch even though it's on the unaffected hand?

Great video, such a speed is a wonder to behold!