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Not unusual at all.
The factory HPFP runs out of pressure on 93 octane, with just a 2.3 upper pulley OR a factory upper, 15% lower. When you add an aux pump and bump up the base fuel pressure, you will get a slightly higher cap, but not much.
E85 requires 30% more volume of fuel by nature, because it is oxygenated fuel. So instead of being at 100% maxed out, you are now 30% over the limit, and will face huge problems like you currently are.
By doing a mix, you are still maxed out. The only way to give yourself flex fuel capabilities, is to underspin the blower and pull power out of the car.
General Ethanol Fuel Limits to follow for OEM Redline (Based off of a baseline dyno number of ~520-540rwhp on 93 octane-ish)
~600rwhp Full E85: Bone Stock ZL1, With an Aux Pump, Flex Fuel Sensor
~630rwhp E25-E30 Mix: Modified ZL1, 15% Overdrive~ + Exhaust, Aux Pump, Flex Fuel Sensor
~700rwhp Full E85: Head/Cam/Ported Blower, XDI30% Injectors, Aux Pump, Flex Fuel Sensor
~730rwhp E25-E30 Mix: Head/Cam/Ported Blower, XDI30% Injectors, Aux Pump, Flex Fuel Sensor
You can screw with this a bit if you add supplemental Methanol or Port Injection, at that point your power limits have much higher limits.
You're down on power because you aren't out of fuel until you get into the higher RPM's. Horsepower is a function of torque over RPM, the less RPM you spin, the less HP you make. So you are making much more torque, because you have the appropriate fuel at the given RPM points down low. When fuel demands get high with higher RPM's, you're out and the entire system doesn't mesh, resulting in no power.
Hope this helps.
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