I'm smoking a spatchcocked chicken at 220. My MES40 is set at 231. I look at the temp on my Maverick go from 214 to 235 and back. At first I kept getting up and adjusting the temp setting on the control panel until I got tired. The last hour I just let it swing back and forth. Is that swing of temps common? I expected the temp to fluctuate but not to that degree. Is this your experience? Thanks.