Stayed in smoker for 11+ hours, till it hit 175 F, then it got wrapped an put in the oven till 185 F. I think I got lucky too. Was able to maintain temps between 200-235 without issue. Think it helped that I had a ton of water in the cooking chamber (full length pan directly underneath the brisket filled with water, and a smaller pan blocking the SFB, also filled with water). I'd say I got lucky, but I just followed a lot of advice I got here temp control, monitoring temperature, cheap immediate mods to the smoker, etc.
Thanks everyone for all your help. You've gained another faithful smoker in your ranks (Wife says I'm now in charge of all barbecue). Looking forward to smoking more critters.