For servos, I have Hitec 635 for ailerons, Hitec 475 for elevators, and Hitec 5645 for rudder. I had a Saito 100 inverted in my UCD initially, which gave me oscillating idles due to problem described above. Now I have a YS 110, which swings a prop 1" larger than Saito 100 can at the same RPM. Saito 100 is fine if you keep it at 7 lb. Mount the Saito upright to avoid the hassle. Easier to fuel as well. It will balance at 5.5" if you put battery above TE., and will fly very neutral at that point.