Used my UDS for the first time last Sunday. I couldn't get the temp below 300 degrees. I had all air ports on top and bottom shut and it held steady at 305. The only thing I can think of letting air in is the lid does not fit super good cause i suck at using a grinding wheel when I cut the lid off the oil barrel. Any other suggestions? The ribs were AWESOME but they only took an hour and a half to reach 190. Im concerned for longer cooks and cooks that need lower temps (like a pork butt or a brisket) that it will not work.