I would use nothing but supersoils if I wasn't using FFOF. A simple perlite and low or non-nuted soil like Light Warrior can be mixed into FFOF to avoid any possible burn issues in early seedling and veg. As a matter of fact this is old info. I think I burnt my first of three seedlings in about a dozen grows that comes out to about 70 plants total, 3-4 years ago, because I didn't mix the FFOF with anything. A pretty simple fix.
What is your "variety" of reasons that you don't use FFOF?