I don't know how flat the wire is in my homeade incubator since I have an egg turner in there now which I'm going to remove for hatch. I'm sure there is a bit of a hump or dip in the middle. It is 1/4 hardware cloth. If the eggs were to roll from a hatched chick and bunch up together say in the middle or the sides, would the chicks have a hard time hatching if the eggs are pressing on one another?