Classic Shrimp Scampi

Name: Classic Shrimp Scampi
Ingredients: 4 Tbsp unsalted butter (divided); 1 1/2 lbs raw jumbo shrimp, peeled and deveined ((16 or 20 per pound)); 1/2 tsp kosher salt; heaping 1/4 tsp black pepper; 1/4 cup finely chopped fresh parsley; 4-5 cloves garlic (minced); 1 Tbsp lemon zest; 1/4 cup dry white wine ((like a Chardonnay)); 1/4 cup chicken broth or stock ((if you have shrimp or seafood stock that would be awesome too)); 1 tsp lemon juice (fresh is best); pinch of crushed red pepper flakes; more minced parsley, for garnish; lemon wedges, for serving (optional)