Moving fielders around is like card counting. If you do it right it gives you an edge if you do it wrong not so much. You can have perfect data and move people to the highest probability of success but it only but you can't cover the whole field. They will hit to where you were before you moved sometimes. You have to make you decisions and live with it. If you look at the majors you'll see hitters go the other way, but you often see 100's of times when they hit right into it. The stats the majors have to work with are staggering.