I have been following your thread and am happy Jazzie is with you. I am sure it will take a little time to adjust...you, too. They will pick up on your stresses, so try to 'feel' what you want them to 'sense' as well. Even with babies I have had for 14 years, there are occasional skirmishes and I always love both of them up, 'make' them 'apologize' to each other, etc. lol Seems crazy, I know, especially with the kitties, but you can watch their body language change when they realize Mommy really does love them both and won't stand for anyone...not even them, her baby..."hurting her [other] baby"...lol I tell them that in my house, they must be polite, and cannot be mean. lol
I will keep watching to see how it is going for you. So happy you've given Jazzie a new, loving fur-ever home.