Hi All - I am using the Char-Broil smoker for the 3rd time and finally got around to getting temp thermometer. The previous two times, I tried to keep it easy and stick to chicken - been told that's the easiest to smoke when you're learning. Well, the chicken was done within 90 minutes instead of 4 hours. Starting the smoker today and having the temperature gauge in the bottom, it's reading almost 400° on the lowest setting. I also have the propane valve barely open. What am I doing wrong? I want to keep the smoker at 250°. Thanks for the help.