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Yeah leave the DI side alone. 366/174 is perfect for the spray window. You have to remember, air is NOT static in the combustion chamber. So just because the exhaust valve is open 1mm when the injector starts spraying, that doesn't mean it all goes out of the exhaust valve.
If you want to lean it out a bit, you need to lean out the lambda target in the Reflex Controller. Simple as that. (Assuming you're using the closed loop feedback)
Also, keep in mind that Ethanol doesn't have as much of a power loss as gasoline does when run richer. There is a larger window because ethanol carries additional oxygen molecules compared to gasoline. I'd aim for .82-.84 lambda on your setup.
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