I have been having better luck with very low humidity during the incubation period, and then raising it very high during hatch. When I run the usual recommended humidity, my air cells don't develop properly and they have trouble pipping.
At lockdown, you want the air cell to fill approximately one third of the volume of the egg.
Spraying is probably a really good idea. I just don't have the discipline to do it every day, so I don't. But it is supposed to help the eggs dehydrate, so it's definitely worth trying if you're having trouble. I wonder if it might also soften the shell a bit over time, aiding with pipping--that's just a wild guess though.
Good luck--it must be very frustrating to have so much trouble. I hope something works soon for you!
At lockdown, you want the air cell to fill approximately one third of the volume of the egg.
Spraying is probably a really good idea. I just don't have the discipline to do it every day, so I don't. But it is supposed to help the eggs dehydrate, so it's definitely worth trying if you're having trouble. I wonder if it might also soften the shell a bit over time, aiding with pipping--that's just a wild guess though.
Good luck--it must be very frustrating to have so much trouble. I hope something works soon for you!