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Just to provide an answer for anyone who might have the same question and happens to stumble upon this thread ...

I "locked" my Front and Rear maps together, then went ahead and multiplied each...

With a Drummer SS muffler, K&N filter and airbox delete, my '04 XB12S is running lean as is evidenced by the 117% AFV corrrection, and by a surging idle speed. My AFV was 111% with no idle issues...

In the ECMSPY User and Tuning guides, the author writes, as a prerequisite to tuning the closed loop area, "Note the AFV and multiply both front and rear maps by it’s value"

To do that for say,...