I can't, unfortunately, or not accurately any more, because I stopped using the Tekgear trainer several practice-hours ago, and now use a variety of tests online, without much rhyme or reason. I mildly regret doing this now, because I've lost track of how many practice-hours I've done in total (my guesstimate would be probably in the region of 14-15). Ah well.
I hear you, I really do, and you may be right. But I'm going with my instinct: I'm not that fast yet on the Twiddler (though closing in on 30wpm), but I have a pretty good 'body-instinct' for developing muscle memory (being a 90wpm touch-typist among other things), and while I'm sure you're right that the most rationally thought-out configuration might enable an extra few wpm at the top end, my fingers don't believe it would make a big enough difference to justify me restarting learning - certainly not wrt the fingering of the basic letters. After all, I learnt typing on QWERTY which is a ridiculous layout by any rational standards, and I'm perfectly happy with my speed on that. (The punctuation and MCC I do keep tweaking on my Twiddler configs, though I don't (yet?) use many MCC, except 'the' and 'and' and 'ing').
Looking online, people have been talking about closing in on 60wpm (after, admittedly, much practice) with the default Twiddler layout, for example. Well, whatever the flaws of my tweaked version of Tabspace3, it is way more fingergonomic (if you will) than that, so I should be able ultimately to get close to that, and that'll do me fine. Given the kind of writing I'm after, I don't need to max out speeds, just to not have a sense of lag.
I can also dispense with a lot of the combinations: I'm using the Twiddler solely for regular prose and solely with iOS devices (and ultimately hopefully untethered), so need no F keys (indeed, I never use my thumb - it brakes my speed hard - even for capitals I have enabled OMMO as CapsLock, and I go CapsLock-Letter-CapsLockOff, rather than fiddle around with my thumb - especially as a right-handed user I'd have to lift it all the way over the mouse cursor to reach shift and those extra millimetres kill me), need few of the MCC phonemes, don't need all the punctuation, etc.
I have three levels of aspiration:
1) Break-even baseline 'efficient' - 35wpm. (not too far off, and if that's all I ever reach, it's still worth it)
2) Comfortable stream-of-conscious - 45wpm. (a way to go, but I'm cautiously confident I can get after a few weeks/months)
3) Wild dreams - 60wpm +. (I'd love to make this, but it's not the end of the world if I never do.)
@AlexBravo, did you learn the basic letters first, then expand to MCC? I might add a bunch of them after I've got the basics down, but for now, I'm focusing on letters and everyday punctuation.