I have had my share of difficulty with poultry in the past. And I'm sure there are others here who could give you better advice than I. But, I did a whole chicken yesterday that turned out fabulous. I'll share the entire experience: First off, I dry brined this chicken with Kosher salt for about 20 hours wrapped in plastic wrap. Then I unwrapped it and let it sit in the fridge for about 5 hours to allow the surface to dry a bit. Then I let it sit on the counter for 45 minutes or so to come up in temp before going on the grill. I grilled it at 420 degrees. When I pulled it off, it was perfect. The meat was moist, tender, and flavorful. The skin was crispy, "shrink-wrapped" as you describe. I think the key things for the crispy skin were: surface drying in the fridge, coming up in temp before going on the grill, and probably most importantly, cooking at a high temp. Again, just my two cents from one cook that I was thrilled with after my previous struggles with poultry.