Hi dsk
I have the same airplane and radio and went thru some of the same problems. I happened to bump the knob to full up one day on takeoff and ran it full throttle for over 150 ft before I realized what had happened !!! The tailwheel never even came off the ground LOL. Also tried throwing full down flaperons on it at about half throttle, I could make it do outside loops using no elevator at all. I am checking with Radio South to see if they can install a three position switch in mine and do away with the knob. In my opinion Futaba should have put a switch on it to start with.

Dale