I'll try to explain how I do it when I'm not in the turns.
When you want to launch, lean back and load the line, but keep your upper body from your shoulders down to your knees straight, do not crouch. Bend at your knees to edge the board into the water, and tee the board to the water right before you launch (make the board perpendicular to the water surface). To launch, dig the front of your board in by pulling whatever foot your ride forward with back about 6 inches. This will stop the board in the water for a split second and cause some suction of the board to the water, and you'll launch into the air. hope that helps some.