Remove the thin white membrane from the back of the ribs using a knife and paper towel.

Combine the first 7 dry rub ingredients in a small bowl. Pat ribs dry, then coat both sides with the rub, pressing it in.

Preheat oven to 300°F (150°C). Wrap ribs tightly in two layers of foil and place on a baking sheet. Bake for 2 to 2.5 hours until meat pulls back from the bone ends.

While ribs bake, simmer ketchup, vinegar, 2 tbsp brown sugar, Worcestershire, mustard, and liquid smoke for 10 minutes. Open foil, drain liquid, brush sauce on ribs, and bake uncovered for 30 minutes.

Move rack to upper third, broil on high for 2 to 4 minutes, turning once, until sauce bubbles and chars in spots. Rest 5 minutes, then slice.