I have a different incubator but the principles are the same. Last hatch I didn't do anything to increase the humidity. It was around 50% up until the eggs started to pip then raised a little bit on it's own as moisture was released from the eggs, then shot up to around 70% when the chicks started to break out. Just left it alone and had 18 hatch out of 22. I have an Rcom incy with automatic humidity control but didn't even connect it up.