It may also be that we are talking about more than one type of problem. I know my engine quit running in bone dry conditions, and in fact I haven't ridden the thing in more than a heavy mist yet. (it's been a desperately dry winter here). That suggests that there's no way water was involved. I haven't even washed the bike yet. There was also no bad running before or after, and that account jibes with others I've read.
I suggest that there might really be a rain related problem which involves higher speeds and serious water, and then another separate problem characterized by sudden death when shutting the throttle on the way to a stop or when downshifting into a turn where no water is present.