So rather than using a cell finisher I transfer my capped queen cells after grafting and put them into an incubator to hold until they are ready for mating nucs. I also hatch some of the queens in the incubator and then sell them or transfer them into problem hives or mating nucs. I try and keep up with the hatching and get them placed ASAP but not always. I find that every now and again a queen will climb back into the cell head first. Most of the time they are still alive and I break away the cell, being very careful not to harm the queen. For some reason the ones that do this end up dying right after I get them free, Why?
They go back into the cell for something to eat and then get lodged in the cell. You need to remove the hatched cell asap and put candy in the cage. Powder sugar in a blender (do not use confectionary sugar) and mix it with honey until you get a dough consistency. Keep it on the dry side.
Sounds like the queens are starving. Queens need food almost immediately upon emerging. In a hive setting the nurse bees would be feeding her during emergence, so your incubator suffers in this respect. Also, the temps needed for an emerged queen are lower than a cell. I would not keep virgins at 92-94 degrees. Also, make sure they have proper moisture in addition to a food source.
I don't think its starvation. They are moving and look fine until I set them free so they can get back out. They die as soon and you get them free. It's quick and its happened a few times now. I would think that if it was starvation the others that have been out just as long and not gone back in head first would die as well but they don't. If they don't climb back in I have no problem keeping them over night until I can get them to a mating nuc. Often, since I've seen this if its to late to get out to a mating yard I pinch the cell shut so they can't climb back in and I don't lose them.