RE: What Starboard for 8.5 + 10 m?
Following all of the good advice above, I did buy an iSonic 133, and I love the way that it rides, like a true slalom board, fast on all points of sail, and tracking well upwind. However Mark did make a very good point when he asked whether I should replace my 8.5 and 10 m sails with just one 9 m sail, and go for a 122: I had a chance to try a 125 after buying my 133, and found that the smaller board feels much more lively, faster, and seems to be easier to get going. However I had only the chance to use the 133 twice, and I definitely need to spend more time on it to tune it better.
Thanks for all the help,