Barb, I also have a cat that has ptitis flare-ups and is hard to manage .... I would continue with the bupe and do fluids until she feels better. Even if they don't seem in pain but they are having some ptitis symptoms, bupe will help quite a bit and yes the numbers are hard to regulate. You are doing the best you can and sometimes that's all you can do. Make sure she has plenty of food and water and hang in there!! when a cat is not regulated they seem always hungry .... and they need to eat. With Payne I would give her the meat baby food in between her meals, that seemed to help a lot.
Nancy and Payne .....