Well, before my energy level crashed to the ground again I did look at 1on1 for Forwards. According to the data the Driving skill there trains faster for tall players, and the IS skill trains faster for short ones. That's when I gave up. (One possible explanation here might be the elastic effect messing up the data.)
Yeah, I guess one of the open question is whether the height effect is tied to the skill or the training type. This (very preliminary) finding would seem to suggest it's tied to the skill, which makes some sense. (Otherwise, for example, it might be faster to get ID on a short player by training OD).
And you're right, I've been a bit surprised that even with the pretty large amount of data we've collected, things are still much less stable than I expected. So, please keep submitting! It may not be obvious, but the data *are* getting much better compared to what we had early on (e.g., the age analysis plot doesn't jump around nearly as much as it used to as new data gets added).