Actually just to clear up something. How can the magnet not be getting enough voltage if it has enough power to pick up the ball? I would think that is what would require the most voltage. Wouldnt holding on to it for one second while it pulls back over the outer lane be the lesser of the two tasks?
At first I thought maybe the ball was catching on the edge of the ramp or something and getting knocked off but after watching it happen over and over again, I'm not convinced thats thats the problem. One other note, the ball is loaded via the cannon from both directions. You can shoot the ramp from the flippers but you can also load the VUK at the top of the playfield which feeds the cannon from the other direction. Its worth noting that usually the feed from the VUK does in fact make it to the outer lane, at least more often than when fed from the flippers. One final note, the magnet itself is loose, meaning I can twist it around and around. Could it be that when it begins to pull back the magnet vibrates or moves ever so slightly causing the ball to kick loose?