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?