Oh, as far as what you will gain in performance, probably not much. You will lose some weight with the feathers, but you will gain some back using the Unibushings. It will probably still be a bit lighter though. I doubt enough that you will notice. You will not have to change your pins I bet. Your FOC will go up as well. And your dynamic spine will get weaker. More weight on the fron = weaker spine, as does less weight on the back. Again, probably not enough to make a difference.

I say if you want to gain some performance go to lighter shaft if you can, use feathers and a 100 grn tip.

Paul