All excellent advice above. And especially the jiggly comment!
But, I feel with our smokers, 190-195 is the target. All the briskets I’ve cooked (usually Costco Prime packers) 195 is the highest I’ve ever taken a brisket. I think these smokers help with so many different things that pellet poopers and stick burners don’t. I don’t have experience with those, just to be fair. But that is my experience with the 3D and from a Weber Kettle.
That said, sometimes we just happen to get a cut of meat that doesn’t necessarily cooperate with what our plans are.
Hope you have success on the next cook!