Just to clarify, when you say "scooped up clockwise around and behind", does behind mean pull the diabolo towards you or away from you?
Towards you i.e. the right unwraped diabolo (assuming right handed) should go towards you (or behind the other diabolo) - I think of it as an inside clockwise sun with the right one in between the wraped left diabolo and your body. This will unwrap the left and put the wrap on the right (or if you sun it further and over your right stick as well will effectively unwrap again into the open shuffle).