Just a thought, I reread your first post, and it seems you still have the Press & Seal on at time of birth? Forgive me if I misread that. Maybe my technique is wrong but I remove the Press & Seal about a week before I expect them to pip. I keep the humidity in the incubator at 70%+ and the egg boxes, of course, have more due to water underneath the egg crate. I use a substrateless method.