I don't use rudder in it and only used it in loops to line up a quality shot.   All I see is most people "picking" in it when I come across them.  They have no clue on how it turns, which is why I've shot everyone down so far.   I know what it's capable of.   
4XTCH is the best all around guy in the Ki-61 right now, IMO.  He doesn't rely on picking and will get down and dirty like I used to do.  I taught him well and he can get it to turn nicely.