SW in the mid 330's is not that bad (or should not be for a 5.0); however, the SW for the standard APD is in the mid 320's. Make an effort to hit more in front to reduce stress on the shoulder.
Tail weighing the racquet will not reduce SW. It will move the COM closer to your hand and make the racquet feel like it is coming around faster. If you truly want to reduce SW, then look for another racquet such as the Pro Kennex or look into mods of the bumper guard. If you punch/drill out 3 grams in the bumper guard, your SW will drop into the mid 320's. HTH.