The brake on one wheel is grabbing when I hit the brakes, not sure the other side is working. I have a add-on controller that has a sentivity setting and I have that on the lowest setting. I put on new brake linings and a new brake magnet. The first problem I had was it won't disengage quickly. So I backed the shoes further away from the hub. Now they grab rather than having a smooth stop. Do you think that the controller is the cause of the brakes not dropping quickly or the brake to hub adjustment?