Well...
12 hours low and slow (200 temp, 175 final probe temp) When I took it out to wrap just the pressure from my picking it up was causing juice to flow out.
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Lesson 1 from first brisket, be a little more aggressive trimming fat cap on top. (This was fat side up)
How else have I ruined this magnificent piece of meat?
Now it has been wrapped in butcher paper, and is back in at 260 with a target probe temp of 200-210 to call "done" and then rest. Putting the probe back in only took maybe 10% the pressure that putting it into the cold meat took ,so I will take that as a good omen for the tenderness.