RE: carve 90 2004
No worries Haiko.
I wouldn't dare to venture too much myself into heavy weight's territories althought a 95 kg buddy need about 15 knots of wind to start planing with my Carve111 and 6.9 sail, i.e., 1 knots more of wind for every 10 kg of body weight with my gear.
However, when making comparison between different gear, it's getting much more difficult to make extrapolation between light and heavy weight riders: some mix of board/fin/sail are clearly better than other. See for example discussion at http://www.star-board.com/forum/viewthread.php?forum_id=6&thread_id=22151