I think that you're doing very well so far but I do agree that they need to work it out among themselves. I also do what K & L do and it's worked for me so far. Since my newest addition,Ziggy, had already been checked out at the vets ahead of time, I just let her roam free and in 3 days she was accepted by all of my other furkids. My cats are used to living with other cats though so this does make a big difference. Good luck and please continue to keep us updated.