The FPR will only work if it is allowed to see the manifold pressure. You just bleed of some of the pressure that goes into the upper chamber, Something like a MBC may work just as well.
I wouldn't recommend you running water or methanol injection. You will loose power.
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Water does richen the mixture as it displaces volume normally occupied by air.
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I do not agree with this statement. Not even close, at least not to the extent of affecting the afr.