I don't go by the manufacturer's instructions for my Genesis. I am pretty stubborn that way. It says not to increase humidity past 65% but I do. I fill all of the channel reseviors in the bottom to the brim and put the plug in and that usually does the trick. Gets humidity up around 68-70%. If that doesn't work to get it up, take out the plastic water pan and use 5 mason jar lids, 1 in each corner and 1 in the center and sit the wire rack on the lids. You can then fill the entire bottom of the incubator with water to jack the humidity up. With a plastic tubing, you can siphon water into the incubator through the vent hole without even opening the incubator.