bdereims, I asked Jim Yachinich, our head school instructor and resident shaft spec speciialist your question. Here is his answer. Ralph
For the shaft I would lean more towards the new True Temper GS-95 instead of the FST 90. In testing I find the FST combination flex shafts are fairly true to flex in the A flex but from there they do not maintain a normal stiffness progression that we would see in the True Temper shafts. From feedback I have seen on the Nippon shafts it seems that they maintain a similar flex progression as the True Temper shafts. Also Nippon shafts are constant weight shaft and the True Temper GS-95 both in taper tip and parallel tip versions are constant weight.
Jim