if the lanes are playing tight I like to stay more behind the ball for earlier roll.if the backends are moving I like to come up on the side of the ball a little and if they are dry I'll come up more around the side for more spin,skid in the fronts.ofcourse you can fine tune wrist/finger positions for even more slightly reactions.add the fact that you can change to different balls,surfaces,drillings and the possibilities are almost endless.