I already have a SM6 56.14* 2* flat +1/2 XP105 shafts F grind and not 100% happy with it's performance. Sure it not the clubs as much as it the person swinging it. You know the saying, "it's the indian, not the arrow".
Went to see my fitter and club repairer today and a new SM6 is on order, 56.10*, 2* flat, same setup, shaft, but a S grind, which we feel will serve me better. I have been playing my old SM5 with better results and feel new grooves can only serve me better.
Hope to see it in about fourteen days. Chrome finish of course! =)