When converting FF to RC, a good rule of thumb is to only build in half the specified amount of dihedral. Otherwise you will find the roll response is way too touchy as soon as you move the rudder, especially if you are retaining the rearward CG.

I recall some people preferred using the radio gear purely as an assist for models like these, so they only had two channels - one was an engine cutoff by servo rather than by timer, and the other was a rudder about the size of a trim tab. The only control they wanted was to stop the engine, and to keep the plane more or less over their flying site. It was a matter of pride that they could complete 99% of the flight without picking up the transmitter