I have the aim top v2 gearbox and I am taking it apart to put in bushings and reshim. When I put the bushings in with no shims and a gear and close the gearbox, there is no side to side wobble at all because the bushings stick up higher. And the gear doesn't spin at all. But it works fine with the bearings that came with it. Should I just leave the bearings in it? And this is a 500-550 fps setup. What should I do?