Ya your 750cc is no good for E85 anyway.
You can probably make it to high 500s. Hard for me to say for sure. You are already at 10 psi just to hit 525 according to your sig... so thats either a little turbo or conservative tuning. If its going to take much more boost, you might not make it. (keep in mind that boost in the manifold is fighting the fuel pressure in the rail)
52psi is about stock fuel pressure.
You have an effective 42psi at 10 pounds of boost. however your rail pressure is probably already starting to fall a little. say you max out the fuel system and pressure falls to 45 in the rails, and youre at 15 psi in the manifold, thats only 30psi of effective fuel pressure you have... and that isnt going to cut it.
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