Well, I got the problem solved. I added a ball joint and nylon connector at the throttle arm. I took off the quick connector at the arm of the servo and went back with an "L" bend. I changed out the metal wing bolts with nylon bolts, which I really don't think had anything to do with my problem, but I did it anyway.

Anyway, I ended up testing it at he house. Full throttle with the transmitter antenna down around 75-100 feet away, and no glitches.

Metal to metal contact "DOES" present problems with a radio system.