Quoted from Aniraf:

Sorry anyone in two threads…I posted in the PinBot one too.
I drilled a new hole and changed the trajectory of the ball guide curve. Combined with a purple shooter spring and a left side ball strike, a full plunge gets to the top 40% of the time, middle 20% of the time and bottom or complete reject the other 40%.
It feels like “skill” since it seems to adjust based on the literal way I release the shooter. I can take a picture of it tomorrow. I’m hesitant to move anything.

Quoted from Rodent:

I’ve been in a similar place with my pin for some time now - it was perfect when I bought, and remained so until I recently did some repair/rebuild work in the pop bumpers. Nothing there should impact ball shooting, I know, but that’s when mine went to pot and only one ball in twenty even made it to red plastic (and then never far enough to drop in the 5K hole)
I spent the weekend reading this thread, looking, measuring, shooting a ball with the glass/game off, reading this thread again, and repeating the study. I discovered that a short pull on the plunger gave the best ball result, and determined it must have to do with how/where the plunger strikes the ball. First step was to replace the plunger sleeve with a new one, and could now hit the 5K hole one shot in ten. After additional observation I then noticed that the plunger tip barely extended past the ball rest point flange, and so I adjusted this metal flange so that there was more plunger contact and the ball sat further down into the contact zone. After much tweaking I found an adjustment where the ball is deep into the contact zone and also evenly balanced on each side (the resting flange is perpendicular to the side rail and plunger) and shoots dead center up the lane.
I’ve now played +20 games since my last adjustment this afternoon and can consistently reach the 20K hole with a full plunger pull, and easily hit the 100K with a bit less pull. Looking forward to seeing if this adjustment holds up last by term