Very progressive edge on this for me with about 60% weight on my back foot. What really helped me with this was, after edging up through the wake, allowing my knees to come up in front of my chest before letting it kick out the back. As with any raley trick, the line tension created by a very progressive edge is the key here. It was easier for me to learn them with a slower cut and edging up hard through the wake to take me more vertical rather than further into the flats.
Some people say to 'slowly let it drift' back until it becomes a batwing. That way didn't work for me at all, as I got slammed when I got stuck about a quarter of the way
. I'm sure someone who this method worked for will chime in though.