If the brisket is tough,it's not done.
How did you determine when to pull it out? When the timer went off? The timer is a general setting that you will have to modify, based on the size of the brisket.
You can't cook Q that way, just my opinion.
The only way to know is by experience, which you'll get with your new Cookshack quickly.
But to help you down that path...
Cook your briskets to an internal temp of 190. I cook them to 200 if I'm going to chop not slice.
For all the trouble, just buy the whole brisket and the extra fat will certainly help it cook very tender. I've even taken the deckle off and put it back in to cook a little longer for chopping.
Just read my signature below and remember the quote...it's the only rule in Q I know that everyone agrees with.
Welcome to the CS club...We'll help you out. Sounds like you're been using other smokers, so bring that experience over here.
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Smokin OkieIt's done when it's doneCookshack BBQ Guide Page