Two changes I have made to my set up to improve even drying. 1. I added a restriction plate to the evaporator fan return made from HDPE flexible cutting board. That worked great, but caused another problem with extremely dry air thru the return vent as the chamber air has more resident time on the evaporator coil which pulls out more moisture. So.....2. I used a triple plug on the cooling output of the temperature controller. I plugged the refrigerator and a small auxiliary humidifier into the triple plug. When the controller kicks on to run the cooling cycle, it also turns on the small humidifier on the top rack. This rehumidifies the incoming air up to around 70-72%RH. As long as dry cold air blows out of the return vent, the auxiliary humidifier runs.
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