I have a Master Forge vertical charcoal smoker with a single three hole (Weber) vent I installed in the lid. I noticed Saturday that with my temp probe inserted into a potato sitting on the grate in the general vicinity of the vent, my temp readings were 60-70 deg f lower than if I placed the potato on the grate on the opposite side of the vent location in the lid. Have any of you all seen this? What is the proper location for the temperature probe in a scenario like this? Thanks in advance.