General tips
Pork shoulder is the most forgiving cut in the entire sous vide catalog. The dense web of collagen and intramuscular fat means you can overshoot cook time by several hours without ruining the texture. A shoulder at 165°F for 22 h versus 26 h will be nearly identical. Use this to your advantage for scheduling.
The temperature you choose determines the texture more than the time. At 145°F you get a sliceable roast with a pink center. At 165°F you get traditional pulled pork. At 180°F you get ultra-shreddable meat for tacos. Pick your target texture first, then set the time based on the size of the cut.
Always season aggressively and marinate at least 12 h before bagging. Shoulder is thick and dense, so surface seasoning does not penetrate far during the cook. A dry rub needs time in the fridge to draw moisture out and salt back in. The difference between a 2-hour and an overnight rub is enormous.
After sous vide, the bag liquid from pork shoulder is concentrated pork essence. Do not discard it. Strain out solids, skim the fat, and reduce by half for a finishing sauce that beats any bottled BBQ. Or freeze it for beans, soups, or rice.
For pulled pork specifically, shred while the meat is piping hot. Once it cools below 140°F, the collagen re-solidifies and the meat clumps instead of pulling into clean strands. If you need to hold the shredded meat, keep it warm in a low oven tossed with a splash of the reduced bag juices.
Anti-tip: do not try to shortcut the cook time by raising the temperature. A shoulder at 185°F for 8 h is not the same as a shoulder at 165°F for 24 h. Higher heat at shorter time gives you dry, stringy meat because the collagen needs sustained gentle heat to fully convert to gelatin.
Sliceable Roast tips
Tie the roast or net it so it cooks evenly and slices into uniform slabs.
Let the cooked shoulder rest uncovered in the fridge overnight before roasting to dry the surface for a deep crust.
Use the bag juices as the base for a quick pan sauce - reduce with cider and finish with butter.
Pulled & Tender tips
Leave some fat on when shredding so the meat stays juicy after broiling.
Spread shredded pork thin on a sheet tray before crisping to avoid steaming.
If storing, mix in some defatted juices before chilling so reheats stay moist.
Extra Shredded tips
Shred directly into a bowl to catch every drop of rendered juices - those keep leftovers succulent.
For carnitas-style crispiness, render in a dry skillet until edges brown, then splash with orange juice to deglaze.
Freeze flat in resealable bags to thaw quickly for weeknight meals.