The incubators will not stay stable on humidity and temps with out the nebulizers going we have tryed with chicken eggs it will not work. It will not work dry we tryed these as well. Egg death. We have to also have the vaporizer on and the humidifier cool air going. It drys my partner crazy. And ac going and fan going. That's way we wanted to do it with broody ducks. I can't win. Little giants real good at staying low humidity while pro series doesn't like to stay low but jump high. In normal chicken eggs. For a year now we used little giant to turn eggs first 18 days. And pro series after that. But when we got ducks everything got mixed up. First hatch we had both going. Second one just ducks. No chicken eggs second time to see what was up.
If so then you need to go back to setting it up the same way for the ducks, make sure the eggs are collected and stored properly and try the hatch like that.
If you were getting the same sorts of trouble with the chook eggs then you have something wrong with your settings or setup.