Others more knowledgeable than me may say something differently, but if you are looking for more distance you may want LESS stiff, or with a different kick-point, than what you are playing. As a general rule, I equate stiffness with increased control, not distance. I just got fit for a new D2 and was put in a Proforce V2 75 with a swing speed of 109. If you're swing speed is in the 90's. you should at least hit something less stiff to see how it goes. There really is no substitute for going somewhere outside that can put you on a bunch of different shafts to see how each works for you.