I found some conflicting info on O2 swing points in searches. Starts with this:
Table {B4105} “O2 Switch Point”:
Set all values to 450mv. This value (450mv) equates to 14.7 AFR and has
been found to enhance the smoothness and the accuracy of the LTFT
values.
Thought the .450 was Stoich and not 14.7 to 1 AFR? Although Stoich of E00 gasoline is 14.7 AFR.

If changing AFR to fuel of say E10 which is 14.2 then Stoich would be the same .450 mv, that is what we're shooting for correct? Stoich?

There's a very small window of accuracy in narrow band O2 sensors which .450 is right in the middle of. So this was my next point of conflict"
The O2 switch points are basically the voltage the computer will switch around while in Closed Loop. So if you want a leaner or richer AFR then adjust your switch points accordingly. I have mine set to switch around ~15.2-15.5 while in a light load, which in my case is ~ 250mV. It is good for a couple more MPG.
Since this is outside of accuracy of NB it could not be accurate, but if set with WB could it work?