IDK what to tell you I've cooked several hundred briskets on my UDS directly over the coals at 300 -325 they always come out quite nice. I cook Fat cap down. After 4 hrs I wrap in a single layer of butcher paper for the duration and go fat cap up. I have never had one take longer than 6 hrs total time. Normally 1 - 1.5 hrs after rapping they go probe tender in the thickest part of the flat.
I never met a Cow that I didn't like with a little Salt & Pepper! Certified PORK-A-HOLIC