Well what I find works is when I pull the kite into a fade from the ground...when I tug the kite, nearly every time the kite does a decent backspin
However, when I try the same motion while the kite is in the fade (but high up) and try a similar move, the kite flips out
BUT, I know the issue, it's all about slack
The fade launch has me closer to the kite so I can catch the fade properly, thus when I start the BS motion, there's more slack involved than when I'm in the air....
Practice, practice, practice