thats not a scoop for me Elk, owning and shooting many bows between 80# and 100#, I have spent many long days for tuning them and finding the best arrow setup, so I know all of that, I have even translated in french for all the french bowhunters the bare shaft tuning method...I have perfect flights with some 950gr fulfilled 2020 (80# range) and 2117 (90# and above) but I would like to try with some carbon shafts...I tryed the safari grizzlysticks but they are very stiff (spined at 208# !!!), very expensive in my country and have a notch weakness conception's that make me ruined a 100# LB on a (new) nock explosion, so I don't want them anymore. I am about to recieve my new border black douglas hex V limbs, 90#@28, in a few weeks and I want to try with them those GT100 fulfilled as explained above...