I have a home built incubator - its huge - will hold almost 100 large chicken eggs. Anyway - I am planning to set the first batch next week / weenend. I have had it running for several days now to make sure its stable & I have time to fix anything before the eggs arrive. I'm having trouble getting the humidity up. It's been hanging around 40%. I know - add more water. I have two dishes in there now with dish rags to increase surface area. When I turn off the circulation fan & let it sit - the humidity will climb to 70%, but with the fan on it stays low. that doens't make sense to me. Plus - I need to add a couple of vent holes - to improve circulation - that will just make it worse. Any ideas?