I recently switched to a homemade incubator from a Little Giant and I've been having trouble with hatching. The eggs candle fine up until lock down, but then they just don't hatch. They don't pip either. When I did an eggtopsy, it looked as if the chicks had an almost leather-like covering on them below the air cell. I was thinking my humidity is too low ( I will be getting a hygrometer soon, I'm just looking for opinions in the meantime. ) This was right when I got it, before I added water. Thanks!