Set up my first cave today (3 cf mini fridge) and set the thermostat to 55. The thermostat has threshold of 1 degree so it will not kick on until it reaches 56 degrees. I am noticing that although the unit has turned off at 54 degrees the temperature continues to drop until about 52 degrees. I assume what is happening is that since the coils are cold the temp continues to drop until it levels out. So my cheese cave fluctuates between 52-56 degrees. Is this acceptable?