Good Deal and Welcome . We like pictures of cookers and the meats so maybe you can take some at your cookout and post.....
I usually run my UDS at 275-300* but it has climbed to over 400* when I had the lid off wrapping the meat in Butcher Paper - it took it an hour to come back down to 300* with 3 intakes capped and lid on tight.
Sounds like u do yours like the Pit Barrel Cooker
http://pitbarrelcooker.com