Bring a large pot of salted water to a boil. Cook macaroni until just tender, 7 to 8 minutes.
Drain and rinse with cold water until cool. Shake off excess water very well.
Whisk mayonnaise, sour cream, mustard, vinegar, sugar, salt, pepper, and relish in a large bowl.
Stir in celery, bell pepper, red onion, and pimentos until evenly coated.
Fold in the cooled macaroni until well dressed. Gently fold in the chopped eggs.
Cover and chill for at least 1 hour. Taste, adjust seasoning, and sprinkle with paprika to serve.
Notes
Variation: Swap half the mayo for plain Greek yogurt, or add diced dill pickles for extra tang. For a touch of heat, stir in a pinch of cayenne. Storage: Keep chilled in an airtight container for up to 4 days; refresh with a spoonful of mayo if it thickens.This recipe is an original creation inspired by classic Dolly Parton's Macaroni Salad flavors. All ingredient ratios and instructions are independently developed.