I will say I was reading this thread when I first got mmpm
I had many pop fires I did the wire separation as much as I could from mpu ps area and it did seem to quite down.
Later I rebuilt the flippers and while I had it all apart I was going to try the solder tabs away from the coil stop as I hear it is better. Well upon putting back together immediately all kinds of crazyness including game resets. I could not believe it. But as soon as I flipped the coil back and put much shorter EOS wires on. Problem gone. The extra few inches of wire made a huge difference.
Need to re read entire post if you have.issue as lots of things tried.
And lots of people that never had a problem at all.