Grilled Barbecue Potato Salad

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1 1/2 tablespoons olive oil, plus more for oiling the grill grates

2 pounds Yukon gold potatoes 

1 teaspoon garlic salt 

1/4 teaspoon black pepper

1/4 cup mayonnaise 

1/4 cup KC-Style Chipotle BBQ Sauce, recipe follows, or store-bought chipotle BBQ sauce

1 tablespoon juice from a jar of pickled jalapenos (see Cook's Note)

1/2 pound cooked and crumbled bacon

1/2 cup chopped celery 

1/4 cup sliced green onions (set a few aside for garnishing the top)

KC-Style Chipotle BBQ sauce:

1 cup ketchup

1/2 cup dark brown sugar 

1/4 cup pureed chipotle peppers in adobo 

2 tablespoons Worcestershire sauce 

1 tablespoon molasses 

1 tablespoon cider vinegar 

2 teaspoons ancho chile powder 

1 teaspoon salt 

1/2 teaspoon black pepper 

1/2 teaspoon cocoa powder 

1/2 teaspoon liquid smoke 

1/4 teaspoon dried oregano 

1/4 teaspoon dried thyme 

1/4 teaspoon mustard powder