Been through this here. Took mine off puppy food and used anti inflamatories for about a week. Had another incident which might have been an injury rather than pano, put her back on antiinflamatories with probiotics (because last session of antiinflamatories ended with incredibly liquid stools) for about 4 or 5 days and seems fine now.
Good luck finding the magic food. Maybe homemade meals for a few months?