I recently demo'd the 913 D2 10.5 R Driver. My swing speed is 100, ball speed 140 with launch angles of 12-14 degrees. The spin rate with the stock shaft Bassara W50 was 3600-4000. We tried the Diamana S+ Blue 62 which brought the spin rate down to 3100 but my swing speed dropped to 94-95 and carry distance dropped by about 7 yds. I love how the driver looks, sounds and feels . I was wondering if anyone has any other shaft or set-up suggestions to try... I don't want to give up on this driver as of yet.