At your weight you don't need much more than 97L/64cm for early planing. The iSonic 107 will be way too large for you in 20ish winds. However you may keep the 7.8 for marginal conditions (8-12 knots) and get a Naish Sprint 6.6 in the middle. It will become your favourite sail. Alternatively go for option (B). At 68 Kg I've been using GP 7.8 and Sprint 6.6 & 5.5 from ~11 to 25+ knots on a board 66cm wide. Perfect match.
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