Not at all dumb, and well worth discussing!

How much you hover is a bit individual I think, but your general observation that high speeds lead to "liftoff" seems representative. I guess what you already know is that it's okay. At the same time you need to have your bearings at all times, so my index fingers at least will feel their homing bumps most of the time I think and the other fingers tend to seek out the key edges for navigation.

Watching Sean Wrona at it shows that it's about grounded hovering if you will – staying above the keys for flexibility, but close enough that you know where you are and minimize distances.

The Amphetype creator has a measure he calls "viscosity" – although I don't think that's the best name for it I think it's about something interesting: Flow. I didn't pay much heed to typing flow before but as I started improving the evenness of my typing I found that my overall speeds increased. Knowing when to burst and when to slow down a little is important (as Ryan Heise also pointed out), but an overall evenness to the typing helps in my experience. Instead of jumping from one word to the next, typing everything more evenly gained me both speed and typing enjoyment.

Again, Amphetype is great. You can analyze which words you've typed wrong, slowly, unevenly etc etc. Then you can generate exercises based on these words. Exercises training the most common words is also useful, I think.

Turns out I have the most problems with: with that which down from have dear where. Obviously there's a 'w' and 'h' theme going on. Norwegian has no 'w' so maybe there's a point, but I type enough English every day that it shouldn't matter so much? Also, those words generally have high hand alternation but row jumps. That may not be my forte.

Thanks for the advice guys. I have not used Amphetype so I will give it a shot. Also, watching a youtube video of speed typing is a level of nerdiness that is almost unmatchable.