I thought I tryed to show my experience but as I understand there is always someone who knows better.
I am not sailing off shore. I sail at sea but in an area of about 2 x 1.5 NM sorounded by islands and beleive it or not - the SLW works in 10 m/s with 6.5 or 5.5. If Formula-boards can make it why should not SLW make it? I have done it, it works and I can not see why I have to be told that it does not work?
We are still off the LIGHTWIND-discussion. Perhaps we could make a definition. Is 4-8 m/s better? To plan in 4 m/s you need a Formula-sail to the SLW but between 5 and 8 m/s it works perfect AND You can use sails between 6.5 to 9.0.