I put a 9 lb brisket on the egg last night at 3am. Now 10, and the rascal is at 195. I've had a bit of difficulty keeping fire down to 250, as it kept wanting to get to 290 or so, but most of time was 230 to 275. I just wrapped it in foil and put back on, now at 250. Since I want it to go 12 to 14 hours, what is best way to get 5 more hours of egg time without over cooking? Thanks for any help.