Hi Dennis,
You are almost 100% correct. There is one thing that changes the performance of the KK....careless moving dudes! I have been trying to figure out why I have not been able to retain heat and it is now blantantly obvious. I knew the guys had probably banged the KK when we last moved as there was a crack in a couple of tile joints that were not there before the move, however I think she took a bigger thump than I had first realised and the ceramic tiles (that remain as a solid skin) have seperated from the inner shell, and I can now see a 1/4" gap between the tiles and the inner shell. This is definately not a manufacturing issue, it is pure carelesness by the movers.
I am doing a brisket as I type and I am fully closed but cannot keep the temp below 140 celsius, and smoke is constant from between the base and lid. I think I have two remedies 1) increase the rubber gasket, probably easier but I worry the tiles may eventually fall off, or 2) injecting pressure grout into the gap to fill the void and rebond the tiles to the inner shell or 3) a new dome although colour matching is going to be tough.
So please everyone, don't use my circumstances as any basis for assessing the longevity of the KK.
Dennis - any thoughts on a potential remedy?
Best to all
Guy