Quoted from jalpert:
Because I hate it when people don't post solutions....
The new troll ramp flaps with installed decal from Marco came in. I couldn't really test the thickness of the current flaps without taking them off, what a pain in the ass these things are to work with.
I broke out the caliper and the flaps on my game of unknown origin were consistently .1mm thicker than the flap with pre installed sticker I got from Marco. And the new flaps made all the difference in the world. The ball was getting air off those and hitting the standup targets high, and that was catapulting them into the air in all kinds of crazy ways.
Also, if you have a restored or cleared playfield, especially if you wax like I do, you might have to move down a color in flipper strength and also down in sling strength. I still get airballs off the targets, but I have new ones coming along with new pieces of foam backing which I'm confident will fix the few airballs I still get.
I have a mirco playfield, the perimeter mylar under the troll covers, I did my own artwork for the Troll decals and then covered them with mylar to protect the ink. No air-balls here.
The only air-balls I get is off the left troll target, sometimes it launched under the catapult wireform, put n extra rubber here which resolved this.
I did have to modify the mirco playfield slightly before installation.
Made an indent on the left hand side to accommodate the lane guide as the whole left hand side was flush.
Also sanded the launch lane groove to the correct length which gives a more consistent launch and less rattling around in the launch lane.