As the rod goes into the backcast, pull down with the line hand. This will accentuate the rod tip power. As you pause on the backcast, bring the line hand up. When starting the forward cast, pull down sharply on the line as the rod comes forward.
With a little practice, it gets to be a timing thing and you'll be surprised how far you can launch that line. As you can see by the photo, my friend Tim is an expert at getting a graceful loop.