Tim,
I do a lot of high heat cooks.
Obviously, no water in the pan.
I cooked a large packer yesterday too.
It's important to let the fuel get hot before assembly. I start with about 3/4 of a weber chimney....and I don't dump the chimney until I see flames.
When I can feel the heat by holding my hands at waist high, I'll assemble the cooker.
I put the meat in as soon as I assemble.
Leave the door off until you get to 400 at the lid.
After that, I'll put the door on upside down and wedge it open with a split log. The opening is about an inch or so.
Hope this helps.
Craig