Carbon don,t bend, they are smaller around helping it to penetrate better aluminum are bending like a snake coming out off the bow. carbon don't as much it take aluminum about 10 yard before it straightens out. carbons are almost striaght out of the bow. Also aluminum bends when it hit some thing carbons don't lose as much energy as aluminum from shot to the hit. so what happens more penetration and a smaller arrow to go through the hole. If you took two fishing pole at the same weight, but one light action and ones a heavy action and ran them into a wall with is going to knock a hole in the wall and with one going to bend?