I made a thread about my eggs not dimpling but reading this makes me wonder:
My eggs were like that too, really swollen, the only one that dimpled was the one on top which wasn't touching the vermiculite, so my guess is that the substrate was too wet? But, I didn't put all that much water in the vermiculite. It was the consistency where you squeeze it and it clumps but if you drop it again, it breaks apart. So not too wet, but apparently it was?