Scoring 11s is not a matter of skill, it is a matter of many things. You must have some skill at judging distance, knowing angles, shooting uphill, down hill, arrow speed, bow setup, knowing where the first arrow in the target, our fathers, hail Marys, arrow size, etc. If you think that it is all skill of the individual, trying shooting two arrows at each target and see if you can double your 11s when you have a high 11 count. Shooting 11s on this forum is the only place that anyone will ever come close to perfect, and any one shooting perfect is really just shooting the bull (not the bull' s eye either).