...I found this recipe for WW macaroni salad, 12 1/2 cup servings, 1 point each. Maybe you could adapt some of the ideas to your potato salad? Or maybe you like macaroni salad, too!
2 cup dry whole-wheat elbow macaroni
1 medium stalk celery, diced
1 small sweet red pepper(s), chopped
1/2 cup cooked frozen peas and carrots
3 medium scallion(s), chopped
1/2 cup Kraft Free Shredded Cheddar Cheese, or other brand
1/2 cup fat-free mayonnaise
1/4 cup fat-free sour cream
1/4 cup dill pickle(s), sliced
1/4 tsp onion powder
Cook pasta according to package directions. Drain and rinse with cold water; drain again. Combine cooked pasta, celery, pepper, peas and carrots, scallion and cheese in a large mixing bowl.
To make dressing, combine mayonnaise, sour cream, pickle and onion powder in a small bowl. Pour dressing over pasta mixture and toss lightly to coat. Cover and chill for at least 2 hours. Yields about 1/2 cup per serving.
It also suggested you could add water packed tuna and make it a main dish...shouldn't be hard to figure out the added points.