Well, natural broody incubation can be superior to a bad incubator, but also a good incubator will be superior to a bad broody pooping on the eggs or even destroying them etc.Yes I realize, but I always assumed natural broody incubation is superior, I was interested to see you demonstrate varrying results in the hatch based on different natural hatch conditions. I have only incubated with an incubator.
In any case to have good hatching results it is essential to have hatching eggs of good quality, meaning from a healthy and well alimented parent stock, fresh, good shell quality, regular size eggs for the specific breed.