I am reshafting my Gen 3 PXG 0311 P from 120 grams to 105 grams. The swing weight dropped from D3 to C7. I have to add about 12 grams to the head. What would be the best way? Replace the screws with (3) 4 grams  or add a 12 gram tip weight? If I go with a tip weight does that change anything else (stiffness, flex point, flight) FYI the existing screws came out very easily and are 1 gram each.