I helped a friend build a car from scratch and we used two linear actuators to raise the engine cover, the rear half of the car since it is a mig engine design. Our actuators are controled through a box that lets us preset 3 stops using the feedback from the actuators internal potentiometer and a momentary switch. However it does not use the feedback to sync the actuators and one travels at a faster rate than the other causing the deck lid to open crooked. The box is protected with a 10 amp fuse and runs on normal car voltage 12 -13.5 volts. I thought putting a potentiometer in series of the fast actuator I could slow it down, but am having a hard time finding a pot to handle the amperage (most likley 5-7 amp). Is there a better way? Or a pot avaliable I havent found yet?