It sounds like things are going well! There may be the occasional 'tiff' but if they're not going at it now, it'll just be a while longer before they're able to be together. You're doing it right, slow intros do work best...Feliway also is a wonder. Rescue Remedy is good for anxiety - and has no alcohol in it. (it's an herbal remedy, this non-alcohol type specifically formulated for pets)