Patrick,

What you mention about holding right rudder at full power in a climb is exactly what a full scale airplane does. I don't know for sure about the model but full scale airplanes are set up with engine thrust (or some of the older stuff has the vertical fin cocked) so it holds heading at cruise power. If you increase the power the airplane turns to the left and if you decrease the throttle you turn to the right. So on a power off decent you hold left rudder. My guess would the thrust in the model is set up for less than full power as you seldom fly a pattern plane, these days, with full power.

Sam