Mark, move the RX as far away from the motor wires as possible. based on the lay out of your truck I would put it at the rear if you have long enough leads on the steering servo and esc.
With all the cash you have dumped into that I am surprised to not see a 2.4 ghz radio system. Am radio and high powered BL. When I made the jump from FM to my dx3r I was blown away at the linear throttle control and increase in range. I can go play next to a power substation and lose visual on the truck before I lose range now.
Yup, get that Futaba FASST system. No glitching for me whatsoever even with the rx next to the power wires.
Castle Neu 1520 on 6S LiPo Powered Gmaxx (Nitro Killer)
Predator with OS .21TM
Supermaxx with Mach .26
Revo with OS .18TZ
Kyosho ST-RR Conversion
Ofna CR with Tekin ESC/Motor (2)
i cant believe you can drive it with the tq system when i first got the mm/7xl setup it would not go but 10 ft and hop around like crazy, tried a couple different ones and alot of different things, still no help, got the 2.4ghz and never looked back