Hi Paul,
I belong the the first group you mention, who knows that putting the kite up, even in strong winds (up to 25 knots) actually helps to stabilise the boat downwind & prevent pitchpoling. I`m not the mathematical anal-yst type, so don`t ask me why. There are so many forces at play I just accept that it works.
A friend of mine has a video on 18ft skiffs in Australia, it`s of a series of races in varying wind-strengths. In one race it was blowing about 25 knots, maybe more. 90% of the fleet put in BIG pitchpoles on the bearaway round the weather mark, and only one boat flew the kite. Those that didn`t were really struggling to keep the nose up, while the boat that flew the kite was flying.
What I find on the Mozzie is that even when the nose goes under, and it does, the boat feels more "pitchpole-resistant", it doesn`t slow down as much as without the spinn, and the spinn seems to lift the bows back up, effectively saving the moment. I find that the boat has more of a tendency to get powered up very quickly & want to capsize over sideways, rather than going in nose-first, a healthy yank on the tiller stops this. What I also find is that keeping the boat flying a hull helps to keep the bows up, could be that in loading up the leeward side of the leeward hull you are using what others have referred to as dynamic lift, effectively maximising the use of the hull`s bouyancy (mathematical types please feel free to correct me here.)
My experience may be very different from yours, remember my mast is only 7,3m long so I have a lower CE in the main & spinn. (Actually my mast is in two lengths of 4m and 3,3m, but that`s another issue which I`ll raise in my next post.)

Cheers
Steve