I don't have the experience or expertise of most on here, but I can tell you a few things. First, I went and built a spine meter to check arrows. I already had the ACCs, and a few all carbons. What the spine meter told me was that I should have saved the money and just gotten more ACCs. They were all within less than .001 spine within the dozen, and spine around each shaft varied less than half of that. The CT Cheetahs were the closest to that with all carbons, and they varied 3 times as much as the ACCs. Second, I got some Axis arrows 2 years ago when they first came out. Put them on an arrow spinner, and most looked pretty good, only 3 of the dozen had a wobble to them. I only shot 6 of the Axis for a period of 3 months. It seemed like the groups were opening up a little, so I spun them again. Now only one of the 6 spun like they did when new. My ACCs that I have are from later that year. Every one of them spins nearly perfect today. Not sure how much difference it makes, but it goes back to that confidence thing.