This is the fourth time firing up the stove and have a couple of questions? The gasket around the stove door, does this harden? Putting the stove into after burn definetlly does needs coals as some mentioned.. With that said when it does kick into after burn I see little flame with flames going into the back of the after burn chamber. I also notice flames appear and they roll around the inside of the fire dome and disappear. Looking through the class it is crystal clear with all the above mentiooned. Also no smoke coming out the chimney. Is that what it is looks like when it is in afterburn???