I carry a Stiff Blue in my GBBII, which plays more like an X-stiff in the bore thru head. Great shaft. The faster you swing it, the straighter it goes. I don't have much experience with any higher end Fuji's, but the stock/cheaper ones don't do much for me. They feel like any other shaft out there.
Have you looked at the Adila NV? It's a rocket shaft too, just like the Blue. What are you trying to get out of your drives, height? distance? boring launch? high launch? are you looking at the 460 Ignite?
R35