I started with Isonic 77 / 8.6 / SL-42. First time on the new 8.6 Mach3. I have never liked bigger sails than 7.8, but this one feels good! Topspeed just below 30 knot with that combo. The 42 fin was a little too big in the gusts.
Wind increased and I changed to 7.8 and SLM-40-fin on the same board. Got a nice full-power sailing with 7.8
Third time on the Isonic-77 now and I must say that this is a super-board! Good speed and full control.