Personally, I think to truely breed queens the very best way is to AI them. All you have to do is look at nearly ALL the rest of agriculture and see that is what they have done. I well remember when my father used to tell me thta when he was a boy, 50 bushel corn was good.
When i came along as a boy, 100 bushel corn was good. Today, it is at least double that again. I know it is not all genetics, but I also know that without the genetics, all the furtilzer and management would not have do it alone.
It takes good genetics, good managment, good weather, the whole 9 yards.