Any idea which of Peter Hart's videos you found this technique on?
I'd like very much to see how this works.
That said, if you try the "step over the mast... stay behind the mast foot " technique I described above,
I think you will find that you gain significant ground upwind, and can tack very nicely, even in the lightest
of winds on just about any board that will float you.
Fore and aft balance/trim gets a bit tricky on < 100 liter boards, but if you stay back, and step over the mast, keeping your weight in the wider and more floaty area of the board behind the mast foot, and figure out how far apart to place your feet to maintain fore and aft balance/trim..