Hello, my IJ was down to holding only about 1 in 5 shots in the mode start hole. Very frustrating. I did a ton of research, and there are all sorts of great solutions. I wanted to try the easiest fix I could first, and go from there. Here is what I ended up doing, and it is now holding over 4 of 5, maybe 9 of 10.
First, as I learned from others, from under the play field, I lowered the actually plastic hole scoop by 2 inserting two washers between it and the play field. That didn't really seem to do anything, in and of itself.
Next I experimented with various foam placements, and that only gave slight improvement. Then, I placed two clear rubber cabinet door protector stops on the bracket, and two small felt pads deep on the left side. The theory I had was that the felt on the left might channel the ball more centrally, and then the two rubber stops might knock the ball down a bit, and deaden it just a bit.
This has been a great fix so far, and back to greatly enjoying the game!
Here is a picture.
Now, you will notice, the rubber cabinet stop on the left is sliding off the bracket. I did notice when I applied it that it was slick, like maybe there was some wax, or oil on the bracket, that was preventing the adhesive from taking. I might go back in and try and clean that part of the bracket a bit and re-apply a new cabinet stop, but the fix is working!!!
Just wanted to share this easy thing that others could try...