Hello, I am currently looking to upgrade my Driver. I am currently using a 907D2 9.5 with a Proforce V2 shaft, S- flex, 76g, 2.2 torq, 267 butt, 7.0 mid, and 78 tip. I am looking at the 915D3 8.5 head. Any suggestions regarding shafts. I stand 5'7" with an 105 mph swing speed. My ball of choice is ProV1x.