Good morning to a you bbq masters out there. I finally man'd up and got a wsm and went charcoal instead of propane (I know I know). Anyways, I have been toying with it and read that built in thermometer can be off by as much as 50 degrees, so I went and bought an oven stand thermometer and hung it on the rack. The smoker thermeter said 250, so I thought PERFECT! However, my heart sank when I opened the lid and noticed the temp on the oven thermometer said 325. It actually got up to 350 before I killed all vents to stop oxygen. Thoughts? Thanks in advance!!