OK .. started with the minion method about 10 coals ... flat lid w/8 exhaust vents.
Once I find the sweet spot on the ball valve ... holding between 225 and 250. I guess I'm a little anal as I would like to get more precise at 235 to 240. A 25 degree spread isn't really that big of a deal. So far so good.
BTW a 2" stack is .4 of a square inch larger than 8 - 1/2 in holes, better exhaust. Do all your control with the INLETS and leave the EXHAUST open.