Quoted from DrJoe:
Having trouble dialing in the diverter mech on the TK lock on my LE. When the coil is engaged, does your diverter have back and forth play in it? In other words, if I reach behind the back panel and engage the plunger mech for the lock diverter, I can move the diverter arm back and forth 1/4" or so (with the coil plunger pushed in). I'm trying to determine if this is by design or not. My shots stick about 1/3 to 1/4 of the time, and the other times they scream back down the ramp SDTM. I did all of the adjustments per the Stern PDF on chuckwert's post.
A little play is fine. I would make sure that nut on the back of the diverter arm is nice and tight, but there will be a little play in the diverter arm when engaged.
Did you review that post recently? In the past month or so I added a ton more information with pictures to help dial the diverter in.
In your case I would concentrate on adjusting the diverters distance from the back wall when engaged. It sounds like the arm is too close to the back wall, pinching the ball, and causing rejects.
Also, be sure that the ramp is as far away from the back wall as possible. Should be able to feel the hump in the ramp as you run your fingers from the ramp to the back wall to confirm the ramp is sitting out from the back wall and not flush with it.
Make sure you have the flipper fans and the flipper strength set to default too (255)
I hope that helps.