I think some of us are missing the heart of Wayne's question. Of course breeding your best to your best will improve your consistancy of good. What Wayne's question is, unless I'm misinterpreting it, is can we ''consistantly'' GET RID of the ''proven'' doe, the doe with the 'magic', and just keep her daughters, and be on top for doing so, or should one keep both.
Through the inconsistencies(big or small) in the yearly results of buck antler quality of breeding the same buck to the same doe, the inconsistencies in the qualitiy of the antlers in ''in the womb brothers'', and the fact that a doe may or may not have a buck fawn for a couple years straight, proving this theory of ditching the ''proven mother'' and keeping only her daughters would likely take decades of breeding to reach any given measure of accuracy in a percentage of what would be best to do - get rid of the proven doe each time and just keep her daughters, or not!