Sorry about your migraine! I know how that feels. Sounds like your values have been very good. There are so, so many factors with this venture, including shipping, of course, and the health of the breeders the eggs came from. I know now, through a series of circumstances, that my Lt Brahma's eggs, although fertilized, will never develop. I've done trials over and over, after a few people never had them develop and I got suspicious. My Buff Brahma girl's are popping out all over the country and none of them have ever been ill, so I had to conclude that it was a genetic thing with Miranda. BUT, now I know.
But, herechickchick just candled about a dozen Ameraucana eggs I shipped to him and every single one is growing, so good breeder health, eggshell quality, good packaging and kindness of the P.O. all come together in this shaky venture. THEN, there's the actual incubation for 21 days after all that. Hard to say sometimes what happened.