OK , Yesterday I took apart the UDS to empty the charcoal and I believe I have stumbled onto the problem. It appears the charcoal only burned on one side of the basket and not an overall burn. I started the charcoal using the minion method coffee can in the center. Ash pan is a cheap grill bottom as per Norco but may be blocking some air. I'm going to drill a series of 1" holes around the pan. Second, Does the Weber grate do a better job of dispersing ash than the expanded metal?
BTW I did the kick the barrel maneuver also.
Small Charbroiller, 40 year old barrel pit, UDS, 97 Weber Performer, Brinkman gas grill.