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If it is a WOT run the O2 should not effect the AFR's.
If the AFR's are not normalized I suspect the result of compairing one system to another is not very valid.
If I read this righ the old system was to lean at 14/1 at HP peak and headers were at 12.5/1. Neither is ideal but I suspect that 12.5/1 will make more power every time.
It seems odd that the motor would run richer after the change unless the chip, fuel pressure, or ECU fuel quality switch were changed.
I certainly am not an expert on this.
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