I'm not really much help other than I can tell you I've never had that problem with my Tommy.

I had the same problem on a full plunge (not on autoplunge). The ball was bouncing up when it hit the ramp bottom plate and hitting the shooter lane bracket- I could see where it had been hit a lot underneath and bent upwards.

I put 1/8" spacers cut from post sleeves under the bracket to raise it a little. It helps but a full plunge will still sometimes hit. I don't want to raise the bracket much further because the right ball return wireform rests on it. I tried messing with the ramp toe plate/bending/loosening/tightening to keep it from popping the ball up, with no effect. It doesn't affect me much because I never full plunge. Messes up my kids sometimes.

Also, make sure your auto plunge arm is dead centered on the ball when it's resting in the shooter lane. off to one side will make the ball bounce in the shooter lane and not make it out.

You need to adjust the blue springy steel thing.