RE: Glitchy/Twitchy Futaba Conquest radio system
I had the same problem with the same plane and the same radio. A 72 Futaba and a Big Stick.
Finally it crashed.
After I recouped radio and engine and intalled on another plane I found out the culprit: it was the aileron servo extention cord.
I would suggest you do range checks using someone looking at the plane while you go far away, removing things like the extension and see what happen. And don't fly until you find the problem.
I miss my Big Stick!!!!