http://www.tennis-warehouse.com/descpagePDISC-POWERDISC.html Would this actually help me maneuver my racquet more effectively or would it just completely throw off my strokes if I were to train with this? I use a PD with no lead tape on it, but I plan on putting some on the 3 and 9 o'clock positions because I tend to hit off center a lot. P.S. - How much lead tape do people usually add to their racquets to have a noticeable difference in the way the racquet hits? Thanks.