Im a new UDS user since last spring and mine has never rode above 320, even with lump. I use a Weber lid and have three 3/4'' intakes. Also Ive never tried to run it higher either, using the minion method to light the coals.
The UDS is beautiful when it chugs along at 275 with ribs or butt in it so I dont care to mess with my set up much either.
Smoke the turkey then finish in the oven has worked best on my practice runs.
Pete-my first UDS,a brick pizza WFO, a leaky Chargriller offest, wifes Weber Genesis gasser,a Lightening Fast RED Thermapen, new baby Traeger