He goes next to it ..sometimes he will go in it ..I change the litter EVERY day so it can't be that !!..
Also he is very dominating in that area and the others wont go near it ..?
Do you change the whole lot of litter every day? of do you mean just the soiled? you know how they can object if its TOO clean, like there is no odour (to them) left, for him to know that he SHOULD go there? - just a thought.
Also, how many trays have you got for how many cats? I know you've said you tried 2 trays, but if you've got other cats too, maybe you need even more than that?
Oh, and don't worry about the biting claws thing, I don't think thats stress, couple of mine do it, and they're pretty laid back.