I've found using slow-mo video to be pretty handy when troubleshooting as well. On my Stargate, the autoplunger would often not be able to kick the ball all the way up the skillshot ramp. When I recorded it in slow motion, I noticed the ball was rolling to the left side of the ramp, which often caused it to rub up against a foam pad near the top of the ramp and lose its momentum. So to fix it, I put a washer under the left screw and the bottom of the ramp, which made it lean a bit more to the right and I haven't had nearly as much trouble!