Agree. Every carbon arrow Ive tried has been underspined if you go by chart alone.Gold Tips are especially underspined if you go by the chart.I think newer string fibers contribute the most to that. Less stretch, more energy absorbed by the arrow. As far as the ACC,s I would agree, but I dont consider them a true carbon either. I think they get their spine consistancy from the alluminum core and alluminum is of course more consistant in spine. That last sentence makes absolutely no sense, but I have no clue on how to word it better.