Hot Spots
Regarding Royal Canine for your EB, I had mine on it for a while and she did really well on it, though not so much that I noticed a dramatic difference between the Royal Canine and the Nutro she's currently on. I believe there's a Sticky that rates the foods and RC is rated very well. Nutro is, too, though I'm considering a switch to either Canidae or Solid Gold. I did a test run of 50/50 Canidae and Nutro and she had, um, "soft serve" bowels really badly, so I went back to Nutro and the problem resolved itself. I know switching food can cause this, but it's never happened before, so I think the Canidae was too high in protein. I'm going to wait a few days and try a 50/50 with Solid Gold and Nutro to see how she transitions onto that. I was able to get quite a large sampling of both brands from my local pet supply warehouse at no cost, so it was a free try before you buy, which was nice.
Good luck with the hot spots. I hope the Nu Stock works as well for you as it did for us.