I'm about 82 kilograms in weight. I've owned and sailed a 147 formula and presently own both the Free Formula 158 and 138. I was surprised how early the 133 plans and how well it goes through lulls. What I'm really interested in knowing are the similarities and differences between the iS150 and iS133. - planing, speed on a reach, upwind, downwind etc. Is the iS150 just a bigger version of the iS133, but for lighter winds with some compromise to top end speed? I am looking for a board that plans earlier than the iS133, has similar top end speed and will carry slightly bigger sails (if there is such a beast). Thanks for your help.