Last year, after hearing such great praise of the Axis, I did what you are considering doing. I bought a dozen Axis after having used ACCs. The Axis were very impressive initially. All but 3 of the dozen spun nicely on my arrow spinner. I started shooting only 6 of them just in case. After 3 months of shooting, I sold the unshot 6 and bought more ACCs. The accuracy I got in the beginning just didn't last, and when I spun the older Axis that had been shot alot, they were much more crooked than when I first spun them. After building a spine tester and comparing arrows, I was even more impressed with the ACCs compared to two brands of all carbons. Whether there is enough difference between the ACCs and AC Superslims, I can't say, as I've never tried the new ones. I doubt that the difference in diameter could make that much of a difference in penetration, but they might.