Argh! What a day... after all the shenanigans last night, the two that pipped yesterday have made virtually no progress in ~20 hours. I've been helping them out veeeeeeery carefully, and one should be out pretty soon. His/her membrane seems really dried out, but it seems eager to get out of there. The other one may take longer- the membrane is still very wet & veiny, so I'm going to let it be and hope he/she will figure it out.
Still don't know about the other three eggs, but I'll leave them alone & hope for the best. It's day 22, so there's still time. The 2 that hatched yesterday seem fine, if a little bit tired. I'm sure they'd like some company in the brooder, though.