What works on a Nacra 17 doesn't always work on a boat that is lighter, nearly 2' shorter and has very fine bows, compared to the huge bows of the 17. The same things happened when the Bimare Jav2 came to the USA and a bunch of Inter 20 sailors got on it and tried to drive it like an Inter 20, they ended up calling it, "The Yellow Submarine" because when you put people on the wire going downwind, and a puff comes along, and you bear off hard, you will drive it under up to the mast, easily, -very easily- compared to the Inter 20.
The Blade is not the same as an F17 and the same techinques do not work on both boats. The Blade behaves more like the Jav 2 (ask Andi Lutz, he has sailed both) and the Nacra 17 is more like the I 20. So figure out your own boat, that's what's going to make you faster. <img src="http://www.catsailor.com/forums/images/graemlins/grin.gif" alt="" />