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I would reset it just so you are modifying the "hard" defaults in the processor as it "learns" with the MAF setup. No sense in keeping what it has "learned" thus far with the AFM in place. You will just be extending the learning process to optimize the MAF increases.
I don't think the gains will be noticeable one way or the other,.. I just think it will speed up the learning curve to start with the baseline settings.
My $.02 of course,
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