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TJ930,
It took a while to get comfortagle with your graphs.
I think I am seeing what I suspect in the non soothed one.
Along about 9 it looks like you make a shift. With the quick drop and recovery in boost the AFR curve has two lean spikes.
I think one spike is from the over swing with lift.
However there appears to be second lean spike when boost starts to come back with WOT. It looks like it might be a big lean surge as the motor starts gulping air before the metering arm can respond.
I could be wrong.
Can you isolate the area between about 9 and 9.5 and expand it?
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