hmmmmmm.....um......... try playing with the opposite motor, maybe it will even them out, or just make sure everything is off and start doing different things to see what they do with dif variables. try playing with them starting down/up, car on/off(it will fight you if its on, just give ot a touch and see what happens) and such. dont know why its doing it really tho bro....just my 2 cents