yes, spine is important, as discussed. And form too, as discussed. I will also add that aiming method is important. I don't want to start a discussion of what "instinctive" shooting is, but let me say that when I switched from instinctive to gap shooting, my accuracy got better. With gap shooting, you use the point of the arrow like a sight. You don't nececarily put the point on the target, but rather you leave a gap between the point and target. The size of the gap varies with range. For example, when I shoot at 10 yards, I put the point of the arrow 1 foot below the bullseye. When I shot at 20 yards, I put the point about 6 inches below. This method has eliminated my wild misses.