I finished putting together my project paragon recently, and the left flippers have this weird, intermittent "stutter" behavior. It happens every 7-8 flips or so. Basically, the flipper starts its stroke then sort of stops and finishes it's stroke. (see link to video). New EOS, transfer, and cabinet switches. I tried running some sandpaper through all to make sure good conductivity (for some reason new switches have some sort of coating on them sometimes). I tried replacing the coil. All switches are properly gapped.
I'm at a loss. What should I try next?