In measureing all of my 900 bowling balls to fill in what i'm missing, i noticed my break, break pearl, creature, and creature pearl all measured different PAPs. In other words, my PAP was different on all the balls, after bowling on the same lane, on the same oil pattern. When all these balls are used, what is causing them to track differently? Do they flare before they make contact with the lane, thus causing a differece in track migration??