Charles, welcome and congrats on your 1st brisket!!!
Sounds like everything worked perfectly....My last 12 lb brisket took 22 hours....my Smokin Tex works like a charm.
Next try and corned beef brisket, smok it the same and you'll end up with pastrami!!!
Do a search, you'll need to soak that corned beef brisket and change the water (while it's in the fridge) about 3-5 times over a 24 hours period.....
good luck
dan