Hi Keith;
i changed from shooting off the shelf in 1984, the first time I met Schafe. After shooting with him . I kept right up with him up to 30 yds, we were both shooting tight groups, after that i was embarassed! at 60yds-80yds, it was absolutely no contest.Anyway he extolled the benefits of having the arrow off the shelf. You see once you get out past your point on range, the target area gets so small and you bow hand is so high that it actually covers the small spot on the animal (target) that you are supposed to concentrate on.
Put the arrow above the shelf and now you can see the target between the arrow and the shelf.Voila ! perfect sight picture! I put one that Paul gave me on my Bow and my shooting improved immediately.The other benefit is of course the ability to shoot vanes , the great things about them is that they are quiet in flite,quiet stalking if they should rub on something, and of course absolutely warerproof.I use 4-41/2 in shield cut vanes, that i make by putting a 5" parabolic vane in my sheild cut little chopper and cutting a 1/2 in off the back end. They shoot great.
If Craig wants to post them ,i've got 4 pics of Shafe shooting in sequence that i can email him.