Yep, I wouldn't recomend anyone to do anything that I do on a boat. Another interesting point is that maybe if you are using long spreaders with a lot of rake when you use no rotation the rig starts to act more like a 18 foot rig where both diamonds can counteract the foward pull of the spin. I think there is a lot of foward pull if your running deep. Now days in big breeze we never release much main or traveller because we are already heading so low that if you do this your just exposing more sail area especially the twisted head which just pushes your noses in. Its a matter of steering and holding on. I think you want as powerful kite as you can get as long as it can handle the apparent wind, its just a matter tuning the rest of the rig to suit. Also I think that drag reduction has to be a big factor when you have more than 20 knots of apparent wind.

Ps Inverted mains are cool we sail upwind with one all the time super fast.