Problem with Heli-tack

[marek]

Hi,

I know this is a basic one, but I'm still having troubles with it.
On the movie below the guy crosses the windline and gets pushed downwind on a new tack, then he rotates the sail.

http://www.boardseekermag.com/techni..._tack_high.m1v
http://www.boardseekermag.com/techni.../heli-tack.htm

I get to the wind line like just when doing a tack, but then I never cross it. I try to tip the rig forward, but I get pushed back to an old tack. I try to force the rig rotation, but I fall into my back every time.
Any idea what do I do wrong?

-marek