Anyone use the Ranco ETC 211 two stage controller? I am looking for help in setting it up. I currently have stage 1 set for heat and stage 2 for cool. I would like to keep the fridge around 65°. I thought I could set stage 1 at 62° with a 5° differential and stage 2 at 67° with a 5° differential. When the temperature is at 67° stage 1 is still engage and not until I set it at 70° did it turn off. Any suggestions?