Quoted from MMA-Baller:I got this solved. The magnet core in front of the prison was not completely in level with the playfield. This was enough to cause fast shots to get airborne and fly over the opto beam making the shot not register. Now that the magnet core edge is adjusted plain with the pf the problem is completely gone.
How did you get the magnet core level exactly? I have the same issue. Mine is flush at the front and has a small lip on the back so i cant raise up the whole magnet core or there will be a lip at the front.