I am having similar problems. I have a standard fridge with two 65watt Helix heat panels for heating. I have a helix themastat with the probe tied to the bottom of the second shelve (almost the middle of the fridge). My helix thermastat is set a 91. I have multiple thermometers set in the fridge and in my four egg boxes. All say 90-91 on them with 95% humidity. That is as high as the humidity gauge will read. The thermometer in the egg box reads 91 but when i oint my laser temp in the substrate or on the face of the thermometer i get a reading of 86-88. I know that 91 is a little on the high side but i have increased it to try and get my temps in the egg box up. I do not have eggs yet I am expecting on May 31st. So maybe the temp will go up when i put eggs in the box. It hasnt changed any even with my increase by two degrees in the incubator.