I use one over two below because I learned that way and because it seems more natural. Other reasons are I build all my own arrows and like to use Mercury nocks which fit a little loose any way and I make my own strings using 14 strands of B50 which makes a little thinner serving. I don't like clamp on nock points so I tie all of mine with serving string so they are also smaller. All this keeps things a little loose so you can't jam the arrow against the nock point and pinch it on the string to draw three under. On a traditional bow, especially one that isn't true center shot, I feel that the arrow snapping free of the string can cause a lot of rear end kick and add the the "Paradox" effect. Also the way I handle an arrow is just by the nock end to place it on the string, so I can draw an arrow align it with the indicator on the nock, put it on the string, and draw without ever looking at it or loosing contact with the nock until I release. After a little practice this is a lot faster and smoother. At a couple of our rondevouse shoots I have a timed station that requires 3 arrows from a quiver in 25 seconds at 3 different targets, and I would almost garantee that those shooting 3 under can't do it. Try it some time and you will see what I mean. I know that the first shot means the most but you never know when a quick second would really help. If you want to try something just for fun sometimes, that really seems weird try the way most native amercians used with the first two fingers and the thumb. Very fast and very strong but feels funny. After all these years I have never honestly picked up on true instinctive shooting. I admit that I do sight down the shaft almost all the time and there fore I anchor high on my cheek just under my eye and use my top finger to help locate just at the edge of my eye. Just another reason for me to have one above the nock. Try both of these and research other methods and use what seems best and most natural for you and shoot a lot and have fun doing it.