FWIW, I tried setting 89 to NO, and it didn't catch one ball in my test game. Probably too small of a sample size to be conclusive, but I don't have time to playtest it a bunch right now.
It seems like different magnet settings have been successful for different machines since day one. I'm glad this works for some, but it didn't seem to help mine. With the new lock options I don't really care about the magnet anyway.