The 315 sounds sweet if it is flexing at 61. I wonder why it is 315 though? A customizable stick should be less than that. Basically it will take around 4 grams on the head to get the SW somewhat decent, then you will want to rebalance the handle and suddenly it's over 12 ounces.
Please help TT Member BruceD get a wheelchair so he can play tennis again - http://tt.tennis-warehouse.com/showthread.php?t=496820