I’ve always felt  you should use the heaviest ball possible, as long as you can maintain
proper speed without undue exertion. Unless you throw a big hook, the heavier ball
usually carry more strikes in the pocket area. the only reason you should go to a
lighter ball is as we grow older we don’t have the steam we once did, so to maintain
ball speed we must go to a lighter ball. With today’s balls you don’t loose much
hitting power.