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Whatever you do don't take the stock O2 sensor output as what's happening, it won't necessarily be accurate.
How are you reading the AFR of the wideband? Custom map result from the ECU in logs or just the visual display in the car? If it's properly setup you could easily rescale the stock sensor to your wideband output, especially if the wideband in a similar position. Or you could not bother and log the wideband output rather than the front O2. So long as the difference is minimal around the CL area, which it should be, then it won't have much of an impact on fueling error.
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