Hmm. Lots of good food for thought here. Need to mull this over and watch my hens with their hatches now. Personally, I don't like the idea of giving them more than 4 eggs to hatch. I gave each of my broodies 4. Even though I will provide food for the chicks, I'd like the hen to be able to rear chicks that all were able to get warm at night under her wings, with no one getting pushed too far to the perimeter. The hen who just hatched 3 of her 4 chicks is a naked neck and the other one still brooding is quite petite, so I think 4 is the absolute maximum they could give equal warmth and bonding to in the nest.