I am getting many airballs when shooting the ramp. On closer observation, they result from hitting the right side of the ramp entrance. This side of the ramp has only a metal edge guard on it. Does anyone else get these airballs? Any suggestions on how to fix this? I slit a post cover and slipped it over the edge, which helps a little. Was thinking of putting a larger rubber ring on the post just to the right of the ramp entrance (which requires lifting that part of the munchkinland playfield a bit). Any other ideas? Thx!