Quoted from Billy16:
I just talked to David about the auto launch issue. He said they have been working on it and as of right now there is no permanent fix. It is going to be a continual battle unless someone comes up with the magic fix. I may try a stronger coil to see if that helps--the next strongest coil per David is a 23700, #090-5022-00T--he said it is about 10% stronger. He also said to make sure the machine is level side-to-side, and try 6.5 pitch.
Well, I spent a couple of hours this morning adjusting everything and its grandmother, and the auto plunge still sucks. I can make it a little better, but never better than 75%.
Ok, looks like i got my auto plunge problem fixed at least for now. When the ball is sitting in the shooter lane it is resting on the auto plunger prongs. They both have to be touching the ball or else it isn't going to shoot the ball in a straight line.
When i would look at mine the two prongs were both touching the ball so i thought I was good. Well while leaning over the machine thinking about bashing my fist through the playfield and trying to figure out why in the F this was happening i grabbed a hold of the auto plunger and pushed it forward. I noticed when i pushed the plunger forward that the left prong on the auto plunger was no longer touching the ball. I took a pair of needle nosed pliers and bent the left prong in so that it was touching the ball just like the right side was touching the ball and now the ball plunges up the shooter lane and around the loop perfectly.
It has missed a few times but its making the loop 8 out of 10 times now and i believe with a little more tweaking that i can make it even better but im very happy about this progress. I was already told about the prongs by some friends here on Pinside but i never thought to push the auto plunger forward, i just kind of accidently stumbled on to it i assumed that if the prongs were touching the ball in the resting position that they would also be touching the ball when the auto plunger was all the way in the forward position. ...not so though.
Big thanks to Pinabll addicted, hoby1 and dts for all of their help on this issue. I'm not gonna say this is the fix everyone has been looking for but this is definitely some good progress in the right direction.