I'm glad you have a proper diagnosis. For what it's worth, C diff is considered a type of pouchitis, but calling it that can cause more confusion than clarity. It forms spores, which help it to survive treatments that seem like they should kill it. If antibiotics can't get rid of it, fecal transplant is remarkably effective.
The probiotic most commonly used to help with C diff is S boulardi (Florastor), rather than VSL. I don't know of any great clinical studies about this.