RE: rolling harrier
Took me a long time to get it right....lots of inputs....all of which the timing and throttle management has to be perfect. Usually I blip the throttle as it's going through the final knife edge portion going into the upright harrier, for me this is easiest in keeping my altitude and the nose pointed up. Like I said....takes a LOT of practice, one slight timing mistake and it throws the whole thing out of whack.
Cap