My new grill is great. It is a clone of the BGE. It cooks wonderfully, but to shut off the vents to save the lump does not work unless I spray alot of water in the egg. I am adding rutland gasket to the lower vent and to the daisy wheel vent. I've tried the dollar bill test to check dome gasket. How long should it take for lump to cool off with both vents closed. This is my first post!