You need to learn how to do a timer. Technically I do misty 5 to back, and dub misty 5 on tramp. But I think of it as switch rodeo to back, and switch dub 10.
so just throw a misty 5. Then to progress throw a misty 5 only when you come around at 5 , throw it so your feet dont touch and you keep rotating to you back, like you over rotated. so that is a way to time it. then you just need to throw it harder going into the second flip. So you would have dub misty10. As far as 14 I have no clue. throw it harder I guess.