Anybody know how to get swingweight up without making the racket head heavy with lead? Head Prestige mp leaded up to 365 g but swingweight is only 237. Wanted to bring it up to around 350 to try. Have 5 grams in handle, 7 inches up and 10g total at 3 and 9 and 5g total at 12. balance point is around 12.6 12.28 seconds for 10 swing test 25 5/16" from butt to bottom of top string. much appreciated.