elmatth, also I wouldn't run the initial temp up much past your target temp. Adjust when you are close and let it settle in for a few minutes. Temps are hard to get back down in a drum. Like real hard sometimes. You may get a temp spike anytime you open the barrel and close it back up. Just let it settle back down without making adjustments.
Hope this helps a little and all goes well!
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NB Bandera with mods
Weber 22 .5" x 2, 26.75" x 1
UDS x 3
Created "The Great Spam Revelation of 2011."