Yesterday I got on a launch monitor and was fit for a 910 D2, 10.5, with an Aldila Rip 60 stiff flex shaft. Club head speed was 91.3 (lower than any other new club I tried), and ball speed was 134.8. Backspin came in at 2335, with a launch agle of 15.3.
Given these numbers, might there be a better shaft for me to try before I buy, or have I likely found the set up that maxes out the distance I can get without swing changes to simply generate more club head speed?