Neo, I haver an 8.6 Severne Turbo and can plane in 11 knots of wind with it and I weigh 85Kg. If I were thinking of going biggger than 9m I would consider a sail with 3 cams definitely.
Early planning is all about technique and if your technique is good the isn't much between a 8.5 when compared to a 9.5.
Best recommendation is take your isonic 137 along to a demo centre and borrow a few deifferent sails.
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