Whoooaaa...I geeked out there for a second with the intake/exhaust matching and your UDS....
My UDS has a weber lid with the stock 4 holes for exhaust. I *think* those are 1/2" holes, giving me a the equivalent of 2" of exhaust. I use 3 3/4" intakes, one of which has a ball valve. That figures to be 2 1/4"" of intake (I'm dropping the square stuff for simplicity).
Most of the time, I run with 2 of the intakes capped, the ball valve in a 3/4 open position and the exhaust wide open. It will run from 225-270 at that setting all day (and night).
Occasionally, I need one intake uncapped (and the ball valve still in 3/4 open position), usually when I have wind, but sometimes if I need the 300-350 range.
Does that help?
Dbl Bbl Smoker, UDS, ECB, Char-Broil gas grill & charcoal grills, SJ - Certified Moink Baller