Does it make sense to have a heavier smaller racket to practice with?? Kind of like putting on the hitting doughnut when warming up to hit in baseball.? If so is there a corresponding swingweight it should be. As I understand it a heavier racket ALWAYS has a heavier swing weight if the balances are the same. Is that true, and if so is there a magic number that is a good sw to have. Say if yours is normally 350 is it better to have say 360 or 370, etc? Also how important would the flex be? Should one try for the identical flex...assuming that one should. Or will a different racket screw things up??