I replaced all the gaskets on my resolute, and when I first fire it up, I see slight areas around the pipe to the color, where there's light. Also... the glass gets black smoke on it after every burn. I may have stretched the gaskets on the doors, when I replaced them. So I purchased new gaskets and will hopefully get a better seal on the doors. But when I close the damper after I have a good ash bed with hot coals within the first hour, how air tight should it be?