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Last year, I upgraded my Great Big Bertha from a BB Lite firm flex shaft to a YS-6 x-stiff shaft. My drives have been a little more accurate, but I think it hasn't made too much difference distance-wise.

I've been trying to find a Great Big Bertha II Pro Series 9.5° driver, but I really haven't found one with a strong flex or x-stiff flex shaft (at a decent price).

One thing I'm thinking about is whether or not a stiff flex would suffice with a Pro Series driver. Slightly closed face with x-stiff shaft vs. square/slightly open face with stiff shaft. Has anyone been in a similar situation like mine?

My swing speed has been clocked by a launch monitor between 110-115mph.

Thanks in advance!