I'm not a professional fitter, but I'll add my 2 cents. I would seriously consider trying those clubs with an R flex shaft. I'm a few years older than you, in the same boat for SS not getting any faster, and plated S flex until 3 weeks ago. The fitter told me I "fit" into either R or S. After much thought, and taking a realistic look at the facts, I'm not getting any younger, I chose to buy G15s with regular flex. After 2 rounds, it was a good decision. I can load these shafts properly, and I don't feel that I need to go after them so hard to get a solid shot. The numbers are important, but to me, it's all about what feels right.