e-85 plug question

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I'll try and make a potentially long post short, but the car on gas with the 550cc injectors runs great, but on e-85 with adjusted fuel to try and figure out the best feel for this first tank on the way home. I put some in by accident a while back and just dumped more fuel in the system, running the SAFC at 0% accross the board from a normal -30%. Wideband will be going in before i run the car on e-85 on the streets, but put a little in just so i had enough to drive around in, but enough that it woulnd't make dropping the tank difficult.

It gave me problems the first time i put some in on accident, but didn't disable the car. On normal pump gas at 0% settings on the safc it runs fine, but i just get black soot and tons of water out of the exhaust. Just wondering if it was a plug problem, but it only acts up under 10% throttle and at or around 0psi only. WOT i show no knock and it pulls just fine.