I weigh about the same as you at 86kg and tend to sail my iS107 with a 9.0 often maxed. The combo is right at the top end sail size of the iS107's limit but works well especially in choppy conditions. I also tried the 117 in similar conditions and while it handles the 9m slightly better I found the 107 was much nicer in chop and definitely faster. When I use my 7.8 with the 107 it is absolutely wonderful, a true joy to sail. TBH though there is not much in it with the 117 probably being better in flat water with the bigger sail and the 107 better with the 7.8 or in chop with either sail.
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