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You should try to get something that will let you check timing. There's only so many things that can effect power and that's a big one.
Your lower power graphs are very rough and that generally indicates that the timing is jumping around or you have poor combustion for some reason. Obviously you are monitoring AFRs, it would be nice if you had someone who could monitor the vanos phasing as well. If those things checked out I would move to "mechanical" stuff, but it looks like your most likely culprit is in the tune.
Have you tried flashing the stock tune back in?
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