If yours is like the one on their website, may I suggest the following:
When heating up, do not allow air flow from the cooking chamber to the warming box
The 2 side intakes, keep the top one closed and the bottom one wide open. The top one looks a bit high to me. Also keep the exhaust wide open. You want inbound air to flow under you coal bed not over it. I don't see a back intake in the picture but if it's high like the side one, I would keep it closed as well.
Super fast Purple Thermapen
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Sipsey: Secret's in the sauce.