That's a tough question for me. I've been toying w/ the idea of going back to feathers from blazers.
Not that the blazer's don't do well , but I shot some of my arrows that still have helical feathers on them a couple days ago and they grouped better.

I also like the little better foc w/ the feathers. They penetrated the target several inches better and the only diff. was blazers vs. feathers. Same point/arrow.

Besides , feathers look cool w/ wraps.