I don't usually cook a full load these days so I couldn't acurately describe my thinking about how to use the settings when it's come up before. I needed to cook 24 butts this week so here's what I did.
I warmed up the cooker while I seasoned them, I only did 12 each day. I put 4 on each of the top three shelves. I turned the cooker to smoke and let it go from 6pm to 8pm. At 8 I turned it up to 180. AT 10pm I turned it up the next notch which brought it up to 240-245. The next morning at 8:00 the butts were beautiful.
The next night I did the exact same thing.
My thinking is that when I fill the cooker with cold meat, I don't want the thermostat calling for heat right away. That results in a hot fire and scorching the bottoms of the lowest rack. Then ease on up to 180 for the same reason, but you also get the maximum smoke flavor and color on the meat at these low settings. By the time I turned it up things were pretty smokey and warmed up in there so the thermostat didn't create such a hot fire.
I never peeked or rotated. If I had to cook on all the racks I'd do the same thing, only I'd plan on rotating the bottom rack with the one second from the top in the middle of the cooking.
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