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All boiled down, I feel your lack of low end is due to too much overlap and too low compression for e85 to have any off boost grunt. The low compression and e85 burning much cooler than gas hinders spool time. Wanna experiment? Try running 50/50 e85 and see what that does for spool time. E85 loves compression/hates low compression. That's why you feel such a big boost when the turbo finally spools. The e85 wakes up along with the boost since it "feels" more compression that it craves. You really need a turbo that is a bit smaller , and more static compression,IMO.
You have gas afr's showing. i thought he was e85? LOL Anyway,I think you are trying to run too lean.