the more places you have for a hen to hide the better the health of your avery is going to be the more agressive roos are better breeders
I'm guessing you're a pheasant breeder? In the wild, the hens don't live with the males, do they? If they only meet up to breed at certain times, maybe that's something that needs to be mimicked in domesticity for their sakes. Would be difficult though, I do see most people keep the males and females together year round.