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I don't think that dip is tune related. Looks like a dyno or Dyno operator problem to me. There is literally nothing in the tune file that would cause something like that. I'm willing to offer a free test of your car on a dynojet or mustang dyno to confirm.
Also a mustang dyno is capable of doing everything you describe with respect to the Maha dyno. And you wouldn't need to dyno your car to know if that problem existed as it would be about as obvious as a punch in the face.
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