Last Friday I cooked my first Brisket on my Good One Open Range but it was not my first Brisket cook. I've cooked Brisket three other times on my WSM. Anyway, I think mine was over done because the flat basically fell apart when we tried to slice it. I did the probe test at about 195 but it didn't slide in like butter so I didn't take it off until it hit about 203. Mine cooked for 14 1/2 hours. I then wrapped it in foil and a towel and put it in a dry cooler where it say for about 2 1/2 hours. My brisket was a full packer that originally weighed over 16 lbs but was a little over 12 lbs when trimmed.
It was pretty tender with good flavor so everyone seemed to like it anyway.
The thermometer on my Open Range was not even close to what my Maverick 732 said. In some cases it was 30 degrees off on the higher side. Mine cooked from 200 degrees when the temps dropped because I needed more fuel to about 270. It mostly stayed in the 230-240 range during the cook.
I did go through a full bag and then a little of another bag of the Good One lump charcoal which I thought was a little excessive. I may go back to Kingsford briquettes next time.
Anyway, your brisket looks like it turned out better than mine did.
Wayne