So this happened....
Chick internally pipped yesterday. No change by 11 this morning, so I made a safety hole. No change by 5pm, so I made a bigger hole. Saw veins so let rest.by 830 no change, but somehow 8nner membrane was trying to chick, so I had to soak it off carefully. That's when I saw it's feet up by its head, and knew it couldn't hatch on its own. Slowly helped it out. It has a HUGE vault. 3 of the 4 have needed assistance. . I candled some of the other eggs and they are all dead. Some of them had picked internally, which means they were probably malpositioned too. I swear it's from incubating in the cartons I hate it, but with detached air cells there's not much choice. Next time I think I will take the ones with good are cells at lockdown and lay them on their sides. Several that were detached when they arrived did reattach and we're fine at lockdown. I feel I would have had a better hatch if they've been laid on their sides.
26 eggs total from 2 breeders. 5 hatched. 3 assisted.