I installed a used Isle Royale in my cabin/future home, I was there for the week over Thanksgiving and whenever I used more than two pieces of wood the temps would go really high. Stovetop temps maxed out my thermometer at 850 and stovepipe temps where around 550, I had the air the whole way closed and the temps would just not stay down. I did notice that their was about a three inch piece of the seal missing on the top load door could that be causing the problem? what is a safe running temp?