Thanks so much for that detailed explanation!
Whooo the Voyager, so nice! That's been on my list for quite a while now, must be so handy. If only that price could come down a bit :)
20 wpm is brutal! That brings back memories from the dvorak struggles haha. So frustrating. But a good strategy of yours, to do the switch along with the voyager, that way the frustration isn't focused on one particular thing which can then be easily tossed aside.
Ergonomics are important to me too, as I'm not really a spring chicken any more. I already switched to a trackball mouse, as that gave me the most problems in my hand muscles, they've gone entirely ever since. But my posture at the desk is still an issue, so voyager might help me out there.
I also see Colemak is more modern (than dvorak) and keeps a lot of the punctuation and shortcut keys in the same position compared to qwerty, that's encouraging. I also see -DH moves d and h so the vim shortcuts remain? Ingenious, absolutely perfect! I feel giddy now, I might give Colemak-DH a try this weekend (and hopefully longer).
Vim had quite a few learning resources, little games to make me get used to the bindings/motions. Did you use similar games or exercises to train your Colemak-DH muscle memory?