Pirate, for your safety your UDS should have an open vent at the bottom. I'm assuming you're controlling your temp by the amount of gas being fed and not by the intake vents.
If the flame goes out in the middle of the cook that drum can explode. Does the burner have some sort of a safety shut off valve should the flame go out?
....UDS....Mini-WSM....Midi-WSM....Mod-ECB....22.5-OTG....34"wood fired pizza oven....