I was there trying this on friday and i think Gareth is right. If you are getting you right hand to the higher 2 finger crozzle thing, then you go for the top with left hand. I didn't manage it quite because i was an idiot and kept changing my beta (and also forgetting where i put my feet). The key thing for me though is where your feet are placed before going for the top because i was not quite tall enough to reach from my starting foot hold. What i do is bring in my left foot so i can move my right higher to a little nubbin then pull up. I think with this foot hold and being fresh, the move to the top will not be dynamic in the sense that your body moves a lot, but that you just quickly move your arm. I slapped the top a few times, but didn't catch a good bit (as well as being too tired). I plan to go back soon though because it is quality! I also want to get on new rose, have you tried that?
