From what I've read, and learned on this sight, mags, internet. There's no reason to be shooting straight fletchings accept where rest clearance is a problem. You should be shooting some sort of offset-helical. The more the better. The sooner, and more spin you can put on your arrow the more accurate it should fly. I started many yrs ago with some pre-fletched straight vanes. When I began doing my own, and used a right helical I couldn't believe the difference!