E85 Air fuel at WOT

I'm more or less a basic tuner, nothing special. As of now my car has been converted to a E85 fuel setup from gas. Engine is a 3800SC with a small pulley, cam, and bigger injectors of course for the E85 (80lbers). Old gas tune on my wideband was usually around 11.0-11.4 air fuel at wide open on around 14-15 degrees of timing. New setup with E85, same timing, but air fuel showing 12.4 from what the scans have shown to me. I have a friend helping me as the car is away, but I wanted to make sure I knew how to adjust if I need to myself as I have HP tuners also when I get the car back. More or less want to understand it all for when I need to make adjustments based on the gas mix for E85 at the pump here locally if I need to. I am also not sure if this is being tuned in Lambda, as I've read that can make a difference too. I just want to make sure I am ultra safe Air fuel at wide open.


Thanks.