The watched pot...it always seems worse when you are tired or trying to coordinate a set meal time.
I had a similar cook yesterday with an 8 lb and 6 lb butt. I got a late start and wanted to go to bed, but the temps just didn't cooperate. Finally, after 10 hours at 275-300 I got where I needed to be. The funny thing, the 6 lb was at the same temp as the 8lb when I finally pulled them both to rest.
Backwoods G2 Chubby, Weber 26.75 OTG, UDS with Weber rotisserie, Blue Weber Performer with gas assist, Pit Barrel Cooker, Smoke Hollow elec. smoker, SJG mini-WSM, Weber Go Anywhere