Hmm I have the same problem with RB at times...not always though, like almost everything else f**ked up in this game, it seems to happen when it's really laggy.
There's not really anything you can do about that.
I don't know much about stats/coaches, I mostly play 2K open with Rafter, Agassi and Davydenko mostly.
Practicing serve and volley against the computer on Expert is a good idea...it will at least help you get a better handle on the mechanics of everything. You've probably already done that a lot though so I'm just talking nonsense probably
