I have a 910 FD 15 degree 3 wd and have had trouble hitting it off the fairway. It has a Diamana ahina 82 Low Mid Flex - S shaft. I recently played a round on a business trip with a rental set that had a 913 F 15 D that had a blue 72x act flex-r shaft. This was much easier for me to hit quality shots off the fairway. I was amazed after playing the other 910FD for a few years. I am considering ordering the 913 F but wanted to know if it is more likely the head design or the shaft that is the reason for the improvement.
Thank You
Vern