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i myself have had the same issue , blame the door mounted temp gauge mostly.....that and it's hard to not over stab rib's with the digital probe ?
i have since added another door mount temp gauge , only to learn the orig. was 30 degree's or more off....and learned you need to stab a rib-row sorta longway's with the digital rather then straight through...hope that help's if even in fractions .
Trying to cook ribs by internal temps is really kinda futile at best.
When you think of each bone as a partitioning insulator and consider the variation in meat thickness down the length of each rib, not to mention from one rib to the other, you come to realize that most likely, the temp you're reading is only the temp at the exact spot of your probe and really doesn't reflect the overall state of the entire slab.
In order to do ribs right, one really needs to learn the look and feel of the meat.