I've been playing with what I know are not the default settings on my machine. 5 balls per game, saucer target lights on the more difficult settings. Over time the front legs sunk deep into the carpet. I tried setting the playfield at 6 degrees. Scores slumped and the appeal went down. Then I cranked it back up - don't know the angle but the back of the backbox was plumb. It was like Christmas morning, ball times tripled.
I'm getting ready to set the dip switches to the globetrotters defaults - 3 balls, saucer lights scan, free game at 360k, etc. so I can compare VP to the real thing more realistically.
How often to you go in and mess with your settings? Change playfield post locations? Change your PF slope?