Kahuna said..
Do you actually loop the kite or send it back the other way normally?
Carve upwind hard, let the kite go up to 12, pop off the water and aim for half a spin, the send the kite into the new direction and it'll pull you around into the new direction... If you' we done it right, even a complete dive of the kite won't pull you off balance. The key is letting the kite go over the top of the window.