I wish I had my own recipe for potato salad. I don't. But I have a true, tried, and tested LINK to one I've been making for years.
I have a love/hate relationship with potato salad. It always sounds good but 99% of the time when I taste a potato salad I'm inevitably disappointed. They're either too sweet, too mayonnaise heavy, miracle whip-y (gross), or too mustard-y. Then you get the ones that have strange ingredients that throw the balance off or even worse, they overcook the potatoes and it's basically mashed potato salad.
Either way... this is the recipe I use. The ONLY way I tweak it to my taste is that I add in about 1/4 cup of minced celery. Otherwise, the proportions of ingredients is perfect as is the combination of mayo, sour cream, and mustard.