I just started my brew day and mashed in at 165 and was waiting for the temp to settle at the designated rest temp. This got me thinking about the variance of temperature within the tun. I moved the prob to different spots in the cooler and got different temps. My question is, is it better to just leave it in one spot and use that temp or move it around and take like an average? I don't want to keep opening the lid to move the probe.