I lost 2 last night myself, that had internally pipped and died. tomorrow is supposed to be hatch day. So I know how heartbreaking it is. And how hard it is to be patient. But there really isn’t much you can do right now.
How long have your girls been laying? Did they take a break and are these new season eggs? Mine are, and my eggs were outside with a hen that I thought was broody (she actually is now, but wasn’t when I took these eggs to the incubator) so I kinda expected many of mine wouldn’t make it.
Just fishing for possibilities on why yours are quitting.... I do definitely think your temperature was too low throughout incubation.
		
		
	 
The first one I lost was her very first egg she ever layer and it stayed in the nest for 6 days before we started incubating... we had to wait on it to arrive so I left it with her for a while. I did notice when I candled that the embryo seemed to be in a weird spot compared to what I had researched and so I kept a close eye on it... 
I put the safety hole in the air sac after it failed to hatch on hatch day, along with the other two that went in the incubator at the same time. 
I lost the second one and when we opened him this morning he had the same green stuff on him and around his yolk that the first did, and he looked like the way he was positoned was what I have read to be a form of malpositioning as well... his head was stuck up under his wing pretty good... 
they do seem to be small though. 
They went in the incubator on December 24th, and I am counting the 25th as day 1 because it is so chilly here. 
So we are on day 32 for the first 3, and then I have two that are on day 30, and the youngest is on day 29... 
I just placed a moist paper towel in there and refilled the reservoir to increase humidity and upped temperature to help... It has been set on 38.6C and I raised it to 39.6C. Is that wrong?
The other 3 do not have safety holes. 
Should I give them one? 
And I did open the oldests safety hole up slightly so I could check the membrane, after I read on another thread to do this and it appears to be not clear but a cloudy white... 
What am I doing wrong?? My kids are thinking I’m killing these poor babies and it’s getting to me... 
I’m a button click away from ordering a new incubator with automatic turner, and humidity monitor because I feel like something isn’t right here...