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I understand what your saying.. If you find out what
the car runs the fastest THEN you take the reading
so its easy to get back to that A/F reading.. we have
found that a engine runs the best(for power) somewhere
around 12.5-13.0(but not always) so the O2 doesnt know
where the peak is at

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Exactly....some intakes are worse about distributing fuel unequally to each cylinder so they have to be richer to compensate and get enough fuel to the leanest cylinders....I remember someone telling me that on one of Dudek's older FAST builds he had to be in the high 10's A/F for max power....