Hi rww, excuse me, i'm not from the Team but own an Isonic 94 2007 and weight 67k (almost as you) and am 1.85 , didn't test the 76 (that is84L and only 4cm wider) but am using a lot my 94L (really 93), i sail almost the same water as you, a large lake that get large chop between 15/22 kt. For that i carry Ka salis between 5.8 to 6.6 and Venom fines between 30 to 36cm, that gear rides fantastic, specially because the 94 is not too wide and Venoms forgive everything. Also rode the 94 with 5.3 , not ideal but goes fine, take a look at 2007 http://2007.star-board.com/viewpage.php?page_id=31
Willy the smilie.
The toys: iSonic 101, iSonic 94, Manta 59, JP FreestyleWave 85, Retired in museum Thommen 270.
KA Koncept 7.5 - 6.6 - 5.8 - Neil Pryde Zone 5.3 - 5.7
Fins: C3 Venoms, Stings, Deboichet SL2, Goldwing 36.
The rider: Senior 60+ but exellent shape, yearly Cabarete rider last time in 2011, GPS 33.4 knots speedster. What else?
Las Islas Malvinas fueron en 1833, son y seran Argentinas!