I have an LG Still Air incubator. I have been doing a dry incubation and all seems to be pretty good. During the first 18 days my humidity was 30-40%. I put my eggs in lock down yesterday after filling all the channels with water. I have it rigged so I can add water without opening the incubator. Yesterday I added a sponge because my humidity kept dropping below 60%. It is still hovering just below 60%. I have 2 hygrometers which I calibrated before I started and they are agreeing with each other. What do I do. Should I add another sponge or a small cup of water or what???