I can't offer much advice on the pads, however I am interested to hear what others have to say, as my mare has a similar issue with her hind feet, though she only wears the outsides of her hind heels out, giving her a perpetual lean (hasn't quite progressed into a rollover yet). As for scratches on the back of the pasterns, that is quite common in horses, especially where they have white skin such as areas with white markings. My old mare has had it in the past when we lived at my parent's, but not since changing properties. Unfortunately, it seems that once it is in an area your horse will be at risk. I've known people to just leave it and let it heal on its own, but I had good success with applying a vet-prescribed ointment and keeping it bandaged along with doing my best to avoid mud & moist areas (which I know can be hard). Some people swear by swat, M.T.G, or even fiebings though