You may be closing things down too late on the climb up. Without trying to hijack your thread, I was trying to dial in my new UDS yesterday and had the same struggles as you, but my valve is right at the bottom. I coulndn't get it to sit at 225-250. I kept going back and forth with it climbing too high, then falling too low with each adjustment. Can any experienced brethren help out with ideas? Do you start with all three intakes open? At what temp do you start to close down the intakes to get it to stabalize? Obviously everyone's UDS has it's own unique intake setting that works for them, what seems to be the average to hold at 230ish? 3/4 open on the ball valve?
Sorry LoveBBQ, not trying to jack your thread, hopefully my questions will help your situation...