Cftbl will slam last ball in ball trough over and over, the ball kicker for loading the balls into the trough repeatedly tries to get the last ball played up the trough ramp. The ramp is clean, the switches are good, the machine is level. It seems like the coil is almost too strong and it it bouncing the last ball against the two already in the trough too hard and coming back down. Coil is 23-800.