I built my UDS with a 1" ball valve and a 1" nipple / cap.
open everything up to bring it to temp, close the cap and fine tune with the ball valve.
Not hot enough? open the cap and tune with the ball valve...
Fatty meats run hotter.... it takes lots of beer er, I mean experience to learn the way around your UDS.
Happy Smokin !
Building "Robot", my UDS:
UDS "Robot" (the easy smoke oven), CL CharGriller w/sfb, Stok Quattro