Like already mentioned, make sure temperature is correct, I dry hatch and my humidity averages around 40%, I’ve seen it as low as 35%, and as high as 50% inside the incubator, when the chicks start hatching humidity jumps up to 88%, without adding any water, I don’t candle until day 18, when they go into lockdown, my hatch rate has been 93% using this method, I am in a high humidity area, central Texas.
My chicks have no problem hatching, and are very lively.
I will keep using the dry hatch method, because if it ain’t broke don’t fix it.