I just realized something!!

The suspension is specifically designed to operate in one direction. My Juggernaut hates reverse! What if when you drive in reverse your front wheels just jiggle because they aren't designed to operate as efficiently in reverse?

As for the arcing, re-program your Super Rooster. If when you let off the gas or hit reverse the brakes enable to fast or not enough, your motor's may act erratictly. Arcing happens a lot of times in reverse and under hard braking. Program the ESC and adjust your trim.