also to add that your first paragraph has been presented to you wrong....

A shaft that fits your swing can produce the best #'s wether this is R-Flex or X-Flex but if you go stiffer then the "shaft that fits your swing" you will gain more control with possible loss of distance and if you go softer you will lose control.

If you are going to transfer energy from your swing into the shaft and your tempo is .9 with a SS of 115 then the R-Flex is going to play like an L-Flex in your hands. You would need a shaft that offers a stiffer profile to handle the aggressive swing.

Hope this helps.