A number of other people in the ch kitty club also have aggressive ch kitties. Have you posted anything on the Yahoo groups? I'm sure you'd get a lot of responses and support there. Eli (my blue-point siamese X) has his moments of nastiness. I had a rescued kitty years back, and Eli took an intense dislike to her for some reason. The poor cat had to live with her food and litter on top of cages, out of reach of Eli. He would lay & wait for her to come down, and charge her like a freight train and attempt to kill her! Luckily she got adopted to a forever home, and Eli calmed down. Rage in ch kitties is not uncommon I hear. I'd be interested in what your vet has to say about Dewi.