Just as a note, my uds has 3-one inch pipe nipple intakes(2 w/ caps, 1 w/ ball valvle) and a 2 inch exhaust. I start my fire basket with about a half chimney of hot coals and all pipe nipples open. As the temps go above my desired temp, I start shutting off pipe nipples(usually the 2 / caps), leaving the ball valve fully open. I then adjust the ball valve as needed, and open on of the capped pipe nipples if necessary. Usually, my uds cruises at about 250 degrees with 2 nipples capped and the ball valve 2/3 open. I use a digital thermometer, which makes life a whole lot easier. Once that I have the drum on cruise, it is just a matter of tweaking the ball valve to dial in the temp that I want. Hope that this helps you somewhat.
SNPP w/ mods, Patio Master(30 years old), Kettle Grill, Copper Penny UDS, and Maverick 73 thermo.
Youth and enthusiasm are easily overcome by old age and treachery.