Ok I'm in the middle of smoking a boston butt, at the 3 hour mark my temp tanked down to 214ish. The only way I was able to get it back up was adding a full lit chimney through the side door? On top of that my smoke isn't wanting to go back to tbs. any ideas? I feel like this wsm should hold its temp longer then it is. I started with the minion method with a full lit chimney on top if that helps.