Hi, finally completed my barrel and tried it for first time. I put a 12" thermometer(calibrated) below grill. I used the charcoal baskets made by Weber full with unlit brickets then added 12-15 lit to top. Barrel went to 270 right away and then I added two beer butt chickens to grill. Charcoal is 3" off bottom, grill is 27" off bottom. Could not get the temp down to 240, stayed around 280 for entire cook. Capped two 3/4 air intakes and turned valve 1/2. Set weber lid on top to accomodate for height of chickens, was not a very tight fit but seemed to work. The chickens were around 5.2 lbs. ea. very close in weight. It took 4.5 hours for the birds to reach 165 internal temp and the did not seem to be as golden as some of the pics I've seen here. They were juicy and tasted good. Does this seem correct?