I've also stretched the red/white/black ESC to Reciever so that it was outside of the chassis, way away from the body. Still no good. I have a GTB 6.5 coming for my other xxx-4 today and I'll swap it out with the 5.5 to rule out the ESC and or the Motor.
I know this hobby requires a lot of patience. It just sucks that I know nobody that is into this stuff. Maybe that's a sign that only idiots like me waste endless money on crap that never works.