Ok, I have never sprayed eggs before to get the humidity up. Seems to me if it raises it any it wouldn't be for long before it evaporated. Have you closed up any of the vents? If you can, empty the water tray and add hot water, and see if your humidity goes up. You will increase the humidity for the whole incubator, then after the hatch let it go back down to your normal humidity..I don't think it will damage your other eggs still cooking. This is what I do, I usually have chicks hatching weekly. On side note: I use the "dry incubation method", so when I add Hot water to the water trays my humidity goes up to 78-80%.
"I'm interested in this answer since I always wondered how to up humidity in the hatching tray on bottom while the rest stays stable. I've been looking at the Ova-Easy by Brinsea and had the same question."
With the Dickey & Sportsman cabinet incubators you can not separate humidity levels between the hatching trays & your turning trays. If you increase the humidity it will rise for all contents of the incubator.
With the Dickey & Sportsman cabinet incubators you can not separate humidity levels between the hatching trays & your turning trays. If you increase the humidity it will rise for all contents of the incubator.