@9a8f090b Glad to see your experiment is going good too!

I've hatched a lot of eggs, only with an incubator, but never let the mom do the work. 

Letting the mom do it all seems a much more natural, and effective way, even if there is some loss like in your case (but often the incubator is not 100% either). 

It's likely a lower hatch rate will make the genetics much stronger as well. 

No going back now!