Might be to do with your pinkie length relative to the other fingers? My pinkie drags when I'm in full crimp position (until the hold is well below shoulder level), to crimp it would rotate my wrist like yours. Is your wrist still rotated in a 4f drag?
I don't think it's necessarily linked to finger length in this case, I think it's more to do with me just picking a hand position that felt the strongest/most comfortable when I first started crimping. That just so happens to be with my wrist rotated, which loads my back three the most (interesting that I've injured pulleys on all fingers except my indexes).I'm interested to know if most people train the crimp position with their fingers square to the wall or if they rotate their wrists like me. Or perhaps like me; they've never thought about it up until now. Very keen on doing things right from now on and preventing injuries if possible. Decided to commit to some fingerboarding after putting off since I started climbing.
I think that's normal