I am assuming the probe will be above the grill grate. If you want to use the shorter probe and my assumption is correct. Why not get a thin piece of flat stock metal to lay on the grate under the probe. That way you could deflect the heat from the heat column around the edge. I am sure it will still run hotter then the center but it would help some.
Sent from my Nexus 7 using Tapatalk 2
22.5" OTS w/Smokenator
Super Fast Purple Thermapen