Slice spare ribs into individual servings, leaving the membrane on.
Place ribs bone side up on a wire rack.
Preheat smoker to 250 degrees with peach wood chunks.
Place ribs on smoker; spritz with apple cider vinegar every 30-45 minutes after the first 45 minutes.
Smoke for 3 to 3 1/2 hours.
For BBQ sauce: mix ketchup, honey, brown sugar, peach preservative, apple cider vinegar, garlic powder, onion powder, black pepper, cayenne, and kosher salt in a saucepan and simmer over medium heat for 10-12 minutes. Let cool.
Remove ribs from smoker, place in aluminum pan with unsalted butter and 1-2 cups BBQ sauce, cover with foil, and return to smoker for 30-45 minutes.
Remove foil, place ribs back on smoker for 20 minutes.
Let rest for 15 minutes before serving.