I am a proud new owner of a chest freezer now being used as a fermentation chamber. I am using a Johnson Control A419 to control the temp. I have attached the probe to the carboy via tape. Is this the proper way to read temperature of the wort. Wouldn't it also take into account the exothermic temp or internal temp of the wort. If not, I need to make some adjustments on the control. Please advise.