My wine fridge had the control unit mounted on the back , I took the cover off it and found it had two screws , one to set the high temp (start compressor) , and one to set the low temp (stop compressor) , I found that by adjusting these two screws a few times , I finally got it to stay within the range I needed for cheese.
Not sure if every unit has these adjustments on it though , but it may be worth a look.