Since does carry 50% of a bucks antler genetics, if you have some genetics you don't like on the bucks (some are only 8 pointers), you should harvest as many does as you can each year that are over 2.5 years old. Then take out any 3.5 year old bucks you do not want breeding, like big 8 pointers.
Eventualy you will have taken out all of the older does, and all of the bucks with inferior antler genetics - and the only deer left are those with good antler genetics.
I hope that makes sense.
God bless,
T.R.