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BTW, the brisket has been at 167-167 for 3 hours now, and smells great!
Bobby, the longest we ever had one hold (at about the same temp you're at now) was for close to 4 hours.
Being in science, perhaps you can explain to us why the briskets (and butts) tend to plateau like that. We've been told that it's when the fat breaks down and renders out, but really have no clue.
In any event, ~most~ packer cut briskets that we've cooked (between 225-275 pit temp) tended to take just about 1.5 hours per pound to reach 195.
We paid attention to two things: The internal temp (as measured anywhere except into the fat), and the use of a long tined fork to test for doneness. If the fork slips easily in and doesn't grab upon extraction, the brisket is done.
In a very few cases we took briskets out before 195 internal, and the magic fork test was correct. In only one instance did we take out a brisket over 200 because the fork test told us to leave it in the pit. Again, the fork test was correct.
The only achiles heel to the CS is the inability to use the "fork" test for brisket, the "wiggle the bone" test for butts, and the "tear" test for ribs. If we keep opening the door to perform these tests, we are increasing our cooking time by far more than were we cooking offset or direct.
Thus, we "settle" for really great Q every time out, in lieu of the chase for the Golden Grail.
Regards, Mike