So strange I've done the dry hatch with these I can't understand why the humidity is so high. I have been thinking about assisting I don't know where to start though as I usually poke a hole in the aircell but one doesn't have an aircell?
Are you candling from the fat end of the egg? Can you post pictures? If they really have no air cell at all and were laid that way, the chicks will probably externally pip immediately instead of internally pipping, like what happens with a malpositioned chick. If it's a humidity issue, there is a risk of drowning. But even a freshly laid egg has an air cell, so you should be seeing some kind of air cell unless for whatever reason they just didn't have them when they were laid.