Jaeme, great to hear about your results! Where did you read that protease enzymes are hard on an inflamed stomach? I haven’t noticed problems with my enzyme supplement, but possibly that explains some things and I just haven’t made the connection.
OTOH, I’ve read that mucilaginous plants like slippery elm & mallow are bad for autoimmune disorders and leaky gut, which are closely related. From this post & one of the first comments: http://www.thepaleomom.com/2012/05/modifying-paleo-for-autoimmune.html (the book discusses it more) And SIBO often causes leaky gut, so it seems they could be an issue for many people following FTD.