Toss 1 lb cucumber and ¾ tsp kosher salt in medium bowl. Let sit for 20 minutes.
Cook the bacon and make the dressing while tossed ingredients sit.
Place 5 slices chopped thick-cut bacon in a large skillet and cook over medium-low heat, stirring occassionally, until browned and crisp, 8-10 minutes. Transfer with slotted spoon to a paper towel-lined plate.
Stir ½ cup sour cream, ¼ cup mayonnaise, 1 tbsp ranch seasoning powder ⅔ of 3 tbsp fresh dill in a large bowl. Taste and season with black pepper and more ranch seasoning powder as needed.
Pour off any liquid from the cucumbers. Add the cukes, bacon, 2 oz cheddar cheeseheddar cheese, and red onion to the dressing and toss to combine. Garnish with the remaining ⅓ of 3 tbsp fresh dill and a few cracks of black pepper.