I don't have any expert knowledge, but I am incubating in a foam bator right now and my humidity is around 12-20% I put water in there but not everyday. I candled yesterday and everything is growing. Not sure how I will increase humidity when it comes to lock down time, It doesn't seem to matter how much water I put in the channels. I guess I will just have to put some dishes of water in there or something. Kinda flying by the seat of my pants on this hatch. I am just glad that I am getting some development. I cooked the last eggs I had in. I get to go through the learning curve again with my grandpas cabinet incubator here in a few days too. hahahah.
Try putting a wet washcloth in the bottom but that cloth must be kept wet. Sometimes it helps. The other trick is to limit the air flow by closing or reducing ventilation holes.
