NAP drop away arrow rest,
With a drop away fletching contact with your rest is no longer an issue the more helical the better. The spin that is created will improve accuracy with field points and be a very big help with broad heads. It’s just like the spin of a football the more spin the better. Be careful of your vane size 4" in most cases will do just fine. 5" will give greater twist but they are more apt to contact your riser. After you fletch your arrow spray them with aerosol foot powder. You will see at what point the rest looses contact with your arrow and if you’re fletching are hitting your strings or riser