For a richer flavor, consider using homemade shrimp stock. You can make this from shrimp shells and vegetable scraps. If you don't have white wine, you can substitute with additional shrimp stock or chicken broth. Be careful not to overcook the shrimp. They should be pink and opaque. The residual heat will continue to cook them after the pressure is released. For a spicier dish, add more red pepper flakes or a dash of cayenne pepper.