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I would recommend checking the turbo system first, also. I suppose if the fuel pump wasn't putting out full fuel levels it could keep the MAP low, but you coudl check that by using either the "low" or "high" electric fuel pump settings and see if it makes any difference. If not I agree that your turbo system isn't getting full input/output one way or another. I think from 8 to 0 might not be that significant when you talk only 21" of MAP. Although, do the two fuel flow gages read the same at sea level? If so but they are diff. at altitude then that's probably a clue, too.
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