Maybe start looking into fuel pump internals. I needed those when i was running e85 on my speed3. Im not sure if its the same with the sho's but the ones i used were from KMD who made them for audi a3(they worked on the speeds).
I'm surprised no one has messed with E85 on their tunes yet. It did wonders for my mazdaspeed3. I was going to say that the fuel trims would be off that would trip you cel but someone already stated that. Hopefully your car is all good now!