I'm going to be making chicken for some friends this weekend, and I need to make four chickens, cut into eight halves. I plan to put four halves on each cooking grate, and I'm not planning on putting any water in the water pan (but the pan will covered with foil and put in place). I hope to cook at about 275-300 until done. Can anyone tell me whether I need to allow any additional time for the chicken on the lower grill? Any hints, suggestions or recommendations??