Accuracy intrigues me. As a former bench rest rifle shooter/reloader, xbow accuracy was just another hill to climb. I shoot Excals and my favorite of them is the 200# platform.
My best groups to date were 1-1.5" benched at 50 yds, 5 shots per group. This was w/ GT L II's, 2" Blazers rt hand helical [AZ-EZ] and 100 gr field points. Y-25. Same basic arrow as Cossack favors.
Once you screw a bhead on, this can change. He's done a ton more testing than I have, I can put a Slick in a tennis ball out to 35 yds which is my limit, and I'd prefer 35'.
The point is, you more or less tune the arrow to the xbow. Others have their favorite recipes that work as well if not better for them. I quit looking once I found what I needed. YMMV.