Heat oven to 425°F. Rub chicken with oil, paprika, and chicken salt; roast on lined pan 20 to 25 minutes to at least 165°F. Rest 5 minutes; cut bite-size and spread in shallow dish to stop steaming.
Meanwhile, cook bacon in skillet 8 to 10 minutes until crisp; drain. Boil pasta with tablespoon salt until fully tender; drain, briefly cool-rinse, and drain thoroughly.
Whisk mayonnaise, buttermilk, lemon juice, chives, parsley, garlic powder, onion powder, dressing salt, and pepper.
Fold dressing through pasta, cooled chicken, corn, and cheddar. Add bacon just before serving; if preparing ahead, promptly refrigerate dressed salad and keep bacon separate.
Serve cool; refrigerate leftovers within 2 hours.