Isotope tuning is different than many other catamarans (especially the H16). It has a balanced sailplan with the mast almost vertical and the centerboards (not daggerboards) fully down (going upwind). Some isotope sailors use no rake (mast vertical). I prefer a little aft rake to give me a slight weather helm. Not much, just enough to provide tactile feedback on the tiller and for the boat to head up if I fall off. I find that a bit of weather helm also helps me point better. Once the rig is set, I can make fine adjustments by moving my weight forward or back on the boat.

Going downwind, you can shift to neutral or lee helm by adjusting the centerboards (how much is dependent on wind conditions) and the sail set.

Regards,
Eric