This blade would be about 15 cm longer, meet the min. weight
Actually the weight restriction on the boards is a Max weight. Because the boards are part of the all up weight of the boat you could actually have a couple of keels and make the hulls really light if there were no limit on the Max weight. Imagine getting all the gravity of the boat on or under the water?
I did not know that there would be a problem with the Tiger boards if there was extra added to the top. Where does the I-Beam end? I would love a set of the Vector Works to try them and see if there is a difference but spending about a grand on a boat that old seems a waste of money. What is the going rate on a used thing Tiger these days? Great boats for new people as the price of used ones are going the way of the stock market. One the other hand I did just put a new sail on it...