Porch Party Shrimp with Mississippi Comeback Sauce

Name: Porch Party Shrimp with Mississippi Comeback Sauce
Ingredients: ½ cup mayonnaise (Duke’s, preferably); 2 tbsp. buttermilk; 1 tbsp. ketchup or chili sauce (such as Heinz); 2 tsp. Creole or stone-ground mustard; 1 tsp. Worcestershire sauce; 1 tsp. Tabasco sauce or any vinegar-based hot sauce, plus more to taste; ½ tsp. smoked paprika; ½ tsp. garlic powder; 1 lb. jumbo shrimp (21/25 shrimp), peeled and deveined, tails left intact; 2 tbsp. extra virgin olive oil; Grated zest and juice of 1 small lemon; 1 tsp. garlic powder; ½ tsp. kosher salt; ⅛ tsp. cayenne pepper