I was recently fitted for a 913 D3 9.5 stiff ahina shafted driver. the person who did my fitting at Roger Dunns is also my playing partner a former mini tour player who I trus completely. he plays a 910 D3 withe the exact same shaft and set up down to the grip. we played this week end and switched drivers on a few holes I was consistently longer 15-20 yards with the 910 and he was shorter by 10-15 yards with the 913. has anyone had these results and can anyone shed light on this for me?