Hmmmm. I've only played Hyur females so far, both as casters and melee, and haven't noticed the things you're mentioning. I haven't ridden a chocobo at all though so that's something I can't comment on.

I use mouse/keyboard as well and have not found any issues with the turning speed (I didn't make any adjustments) and I'm the type that tends to notice slow turning right away in any MMOs I play because it drives me nuts. In fact I have to say that as far as movement goes I've been pretty happy with the game because it does a lot of little things the way I like them, like automatically stopping my character from a run if I click on a quest giver.

I don't discount your experience at all, but I'm wondering if there is some other factor(s) at play. Granted, there's a lot I can't see in my character animations because attacks in this game are so "flashy." (^_^)