I built a test 7 iron using the iDrive Tour shaft thatโs supposed to be the same as the FGS+. It took a while to find a flo plane, and I had to re-do it at the playing length. Maybe these filament wound shafts donโt have spines, but they still have irregularities.
I reshafted my XR16 4 wood with the FGS+ electric yellow shaft. Flo-ing is easier on the wood shafts, so far.