Adding lead can help you develop a more fundamentally sound swing.
I suggest adding about 4 grams at 3-9 and maybe 3-4 grams at 12 just as a start. The racquet will feel quite a bit heavier w/ that. You can use that extra weight to develop changes in your swing. It can help you get more of a lag, lay your wrist back more, use more of your body and less arm, use your arm only for control etc etc.
Give it a try.
Yonex VCore 100s - SW 351 6pts HL
Tour Bite / Luxilon 4G 16 @ 51lbs