With that much pork, sometimes it best to put the frozen pre-shredded in aluminum pans in the oven with Apple Juice! I tried the boil method before (works great for smaller portions that are shredded) much pork and it gets frustrating waiting for the whole roast to come to temp.
Peace and Smoke,
My Weapons: Custom rig - Kandi, UDS; Bubba Keg; 22.5 WSM x 2; 18.5 WSM; BWS extended party; BWS Gator and an Onyx Oven; 29' ft Coachmen Leprechaun (Lola); Avatar by Grillman.
Dan Chambers get well soon, so we can tell you to "Shut up Chambers"