I know rules are rules, and the 140° is the "rule", but one school of thought is that with whole muscle meat, the surface is where most of the baddies live. If your internal was 133° the surface would have been higher. Now, how fast the surface took to get to 140° is anyone's guess.... so you made a safe call.
Did you happen to take a second temp on the 155° butt to make sure the 155° was not a false positive, like maybe you were in a fat pocket?
And regarding the 155° but, it took 7 hours to get there... how much longer did you cook it to get the tenderness you wanted?
Or like you thought maybe the pan was a heat sink or
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