Reason I suggest this is when I did 4 slabs of bacon, I used 3 IBT probes in 3 of them, and the TP-08 in the one.
They all started at X and stayed within 1 degree all the way through 6 hours of smoking, just inching up to 90 degrees.
(The TP-08 was at 91)
Even when I've played with them together since, 1 degree spread.
Yours looks like a 6-7 degree difference, sometimes one ticks up, then the other follows. If you want to be as proportionate as possible, I'd split the difference. But one may be truer than the other.
Many use a "boiling water" test. Just remember it is subjective to elevation as well.
But I don't put a great deal of faith in retail level thermometers. They are not like Industrial thermal controls.
Besides, I'm going to eat it if it is overdone or underdone anyway. Until I find that "Ahh" point.
Maybe I've been married too much, but I don't think I could tell the difference between 132-135-138. Not enough to send something back to the kitchen anyway.
One of those two probes you are going to like and grow to trust. The other can be your pit temperature probe.
