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Those clamps make all the difference. The cook chamber is now completely sealed. I did a 9 hour pork butt cook yesterday and my digital temp gauges were reading consistent with the analog gauges. There's no more of these crazy way out of kelter readings.
Biscuit test says its still cooler on the door side of the grate, but not nearly as much. Big improvement in the corner at the stack end, next to the door.