I just reread your first posts, I think he is going to come back positive for an ACAT mutation. I would be surprised if he didnt. Me and Tdogg (I hope he still is anyways lol) are studying this one (or trying to anyways) in hopes of coming up with some of our own treatment possibilities, though there is limited info available. Acidosis is common with ACAT, as is cradle cap, greasy fatty stool, and sometimes bumpy skin.
What are his mood and behaviors like the last couple years?
Do you have any silver fillings?