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Have you calibrated the probes?
Only at room / ambient temperature - I'll chuck them in a pan of boiling water later, and calibrate them to my Thermapen
The pit probe is bang next to the meet on the grate - something odd would need to be happening for differences like that to be happening. Although it could be an airflow thing I guess.
I'll post a graph up later to see if I'm missing something obvious
Have you calibrated the probes?
It's odd that your temp at the grill is lower than the food, are you sure the readings aren't inverted? Or are you monitoring pit temp at a place that is anomalously cool?