Rudder to help turns???

[Rhah]

Personally, I only use rudder if I'm in a banking and diving, or banking and climbing (I can't think of the actual name of the manoever, sorry!). I only apply it at the top or bottom of the curve, but not when I'm at a full turn or the aircraft tends to flip.
You don't need to use much rudder, just nudge it a little to swing the nose of the aircraft around.

Then again, this could all be completely wrong, so its probably best to wait till a more skilled pilot replies!