We have a TAF on location and I can't figure out why it constantly drains down the center. It has somewhat weak/slow flippers compared to our other games. The problem seems to be that the playfield isn't pitched enough. I can get a ball from the return lane to roll completely off the flipper when holding it up, is this good or bad? The balls strangely seems to just gravitate toward the center drain. Any tips? It would really help the game play better for our customers.