need help guys

[_paralyzed_]

I feel like such a tool for not figuring this out on my own, but I'm stuck.

Setup:
LS10
MM with CC bec and this cap http://www.rc-monster.com/proddetail...=35vcap&cat=21
540c 8xl
cheap nimh stick pack for testing (will accept 4s donations)
JR xs3 and r135

Problem:
It works but not right. Steering works flawlessly. Will respond to forward and reverse inputs but not "fluidly". Sometimes it will remain going forward "on throttle" even when trigger is returned to neutral. I tried 3 different receivers. The trigger on the radio seems to just be a potentiometer, the only thing I can come up with is a dirty pot? I don't have another tx to try so I thought maybe you guys could read this and say, "yeah it's the radio douchebag", or, "it sounds like X you flaming retard". Thanks for reading.