Hi Turnnburn,

I have been told not to balance a stab like the F-18, F-15, F-14 , BAE Hawk, where it will stay level when the linkage is removed. This will cause the servo (digital ones) to hunt for a neutral position because of a no load condition. To see if this the problem, just lay a small weight on the leading edge at the root of the stab, next to the fuse. If the servo still jitters around center, then check you connections.....

Larry