When my CT4S hits higher RPMs, the servos start to glitch. And, they don't just glitch a little, they jerk all around. All radio equipment is in good condition, battery charged, etc. Could the interference be caused by metal-on-metal inside the chassis somewhere? I'm glad I found this out before I tried to top the speed out on this thing.

Things I've tried...
Different servos
Completely different radio system(stock AM and Futaba FM).
Different battery(4.8 and 6.0v)
Holding the reciever above the aluminum upper deck to see if the metal deck as transmitting interference to reciever