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Remember the switch points are for the "running average" of the o2 mVdc to generate the STFT's which then alters the LTFT's.

If you have the LTFT's turned off and STFT's tuned, make an o2...

I don't know if many of you know that the AFR sensor used by the AEM, DynoJet, and AutoMeter widebands are used on the Cadillac SRX as a front o2 sensor. If there were issues with sensor drift GM...

Here's another wrench to throw into this mess: Have you checked your highway mileage in closed loop compared to open loop with the wideband?
If fuel economy is better with the NB's active (Closed...