I think what I'm going to say may echo thePest, but I can't fully visualize what he's saying. My solution to this problem has always been to adjust the spring on the side that is not moving enough. On the side where the pad is NOT moving, use a screwdriver to lever the spring out from it's perch. Then bend the spring out away from the fork, giving it more tension. Push it back into position. You should have balanced the spring action a little more in the process.
Of course, if the toothed nut belongs in front, ignore the above.