Steering Jitter
 

I recently added a dual cell to my SE upon doing so i have now got a lot of jitter 1] when i am on the throttle the steering jitters and 2] when the steering is returning to center, i had 7 step steering prior to adding the dual cell, but did the 7/7 mod anywayz avoiding the resistors after and nothing changed, how can i fix this, the car has not been FET'd .