I use the probe test for all pork and beef cuts, I do not like mushy chicken, so I go for a little more resistance. The temp is a key to when to start testing. Once you get to 165, you know it will be time to start. You might look into getting a driveway drip pan to put your smoker on, it cuts down on mess on the concrete. I like to lay chip packs on the edge, as stated above. And it only takes two or three pencil sized holes to work.
I'm feeling bearish, and I'm packing a Wusthof Grand Brisket slicer from MABA
"perhaps...but then again...maybe not..."