1. If you're shooting blazers....the amt of helical you're able to put on it isn't likely negligible. Think about it. It's a 2" vane.
Wrong. Helical is helical. Be it a 2" vane or a 5" vane. It is still the same.
I use as much helical as the diameter of the arrow shaft will allow me to use.
Bohning is now making a jig specifically for fletching blazer vanes with a helical fletch.