General tips
Skin must dry completely before bagging or it'll never crisp on the grill. The trick is uncovered overnight in the fridge - the cold air pulls moisture out and leaves a leathery surface that turns shattering-crisp under high heat. Skip this and you get rubber.
Brine for 12 h before sous vide. A simple wet brine of 5% salt by weight (about 1/3 cup per quart of water) seasons the meat from the inside out. Sous vide alone won't penetrate seasoning past the surface, but brining will.
Sous vide at 150°–155°F for 1 h 30 min–2 h. Lower and the texture is too soft for grilling; higher and you've lost the juiciness. Dark meat is more forgiving than white, so if you're cooking thighs only, you can push to 160°F.
Sauce in the last minute over direct fire, never longer. BBQ sauce burns easily because of the sugar, and you want char marks, not a layer of carbon. Brush on, flip immediately, brush again, pull. Three turns max.
Anti-tip: don't sauce in the bag. Cooking BBQ chicken in sauce gives you a steamed, gloppy texture and ruins the bark you're trying to develop on the grill. Save the sauce for the finish, where it can caramelize properly.
Juicy & Tender tips
Works with breasts, thighs, drumsticks, or whole pieces
Don't put sauce on too early or it will burn
Thighs stay juicier than breasts