I just got mine in the mail the other day. I use a straight clamp with 3-degree off-set. I found that the more off-set you give this clamp the less contract the ends of fletching have. You have to find a happy medium with the provided adjustments. I also learned that if you pull entire length of vane out from clamp about 1/16 of an inch you will get 100% contact on the sharper angles. Give it a try.