You'll probably read this and think "There she goes again". That being said, have you tried Clomicalm? It's for inappropriate behavior, aggressiveness, urinating outside the litter box, etc. It's prescribed mainly for dogs but can be given safely to cats. I have 4 of my cats on it and have for a couple of years now w/no side effects whatsoever. Five mg. before bed, problem solved. Why not ask your vet about it if you haven't already? I originally started my two males on it who fought constantly because the younger, Specs, wanted to take over and the alpha male, Boo, wouldn't have it. Then the pee wars started and a couple others decided to join in and that's when I said "Enough!". Why not ask your vet about it? It saved my household, my furniture, my cats from getting beat up and my sanity.