I will say that I didn't read this whole thread and I'm not really sure what started the "egg carton phase". I realize the goal is to try to get better hatches, but I'm not sure all folks will experience that if they don't resolve their faulty tools of incubating. For those it seems to be working for, I think that's great and keep us posted on additional successes.
I will speak from my own experience and years of hatching that I have neither used this method nor heard of it until recent posts. I have always hatched the traditional way of laying the eggs on their side as they would be in a nest environment. I often get 100% hatches and when I don't, it is usually my fault ora failure in my incubation controls. JMHO
Jody