Warm 8 cups of water in a 5qt on high heat until boiling briskly.
Add 1/2 TBSP of iodized salt to boiling water then stir until well-dispersed and fully dissolved.
Add macaroni to water and continue boiling on medium to medium-high heat for 7-9 minutes, or until Al Dente.
Remove macaroni from heat and drain water using colander, then transfer to 8qt mixing bowl.
Place macaroni in refrigerator and allow to chill while preparing dressing & chopping vegetables
Chop celery, onion and bell pepper until small dices.
For dressing, add ingredients (mayo, sour cream, white distilled vinegar, sweet relish, dijon mustard) in separate small mixing bowl and mix until well combined.
Remove macaroni from refrigerator, add chopped vegetables to bowl, then mix until well combined.
Add dressing to bowl and fold together with macaroni + vegetables until well combined.
Add spices/herbs (excluding paprika) to bowl and fold together with macaroni, vegetables and dressing until well combined.
Transfer macaroni salad to serving bowl, cover with plastic wrap or foil, and chill in the refrigerator for a minimum of 4 hours (ideally overnight).