Pip then Die

[Erik-Sarasota]

I have had an issue with a number of baby chicks pipping but never succeeding in breaking out of the shell. Day 1 and 2 I see some small progress, but by day 3 the cheeping ominously stops. Is this an indicator of something I am doing wrong with the incubator/humidity levels/temp? Any insight is very much appreciated.

 

[chickens really]

Possibly shrink wrapped if humidity isn't high enough?
Sometimes humidity is too high and they drown too..