Same with me. Once it's going for a bit it drops a lot with the heat and I add one trough of water in the bottom. By lockdown I add water to both troughs and plus a soaked paper towel and its right about 65Humidity in the incubator goes down with increasing temperature. 45% in my house becomes 15% in the incubator which is too low for hatching. It does not take too much to get to the 35% level.