I don't think it's helpful to focus on single body parts. It's a whole. It's one thing doing one thing and the whole arm is a whip/kinetic chain at the end of the rest of the one kinetic chain. Keep the whole arm loose and whippy. And do a lot of long toss till you get the feel, your own personal feel, of what efficient and effective feels like. Don't neglect the pull down phase of the long toss. Google Jaeger if you don't know what that means. You can find his stuff on youtube as well.