I weigh about 100-105kg and test paddled SF S carbon at Gorge (8 mile Downwind) and it was fine. I paddled the v8pro ultra the prior year at Gorge and bluefin S glass last year. Including a test run on a Boost, they all easily allowed water in the bucket at my hips when at crest of wave. The SF S did not. I guess due to higher rails, but possibly due to lighter layup, or both. With more experience and better technique, I am sure none of the boats would swamp so easily from the sides, I.e. it is my fault. But, logic would suggest that the drier boat supports my weight better. I am renting SF S glass this year. I notice the Think skis list lower max weight than Epic and Stellar, while Fenn has no posted max weight. What would happen if I got in a Think with a capacity a bit under my weight? Would it sink? I Think not. It just probably would perform a little less than optimum. At 105, I say you should not worry about capacity of SF S. There are others on this forum with much more experience than me with SF S that could support or contradict my opinion.
KR McGregor Rhythm, V10Sport, Swordfish S, Fenn Tarpon S, Fenn XT, Twogood Chalupski, Findeisen Stinger spec. Had: V12, Stellar SE, Huki S1-X, Burton wedge2, Fenn Tarpon