RE: aluminum and carbon
Those are the Easton A.C.C.'s. I use to shoot them as well, but they end up taking a set bend just like a regular aluminum arrow can. Way too much money per dozento have to worry about them bending on you.
The carbon was splintering at the insert end as well. Better off getting an "all" carbon arrow than the A.C.C.'s in my opinion. Been there done that.