Sounds like it could of been fudged to work with a faulty MAF.
As said before the ECU can limit boost if it detects problems with the MAF.
It may be that the car had the problem but it was found that running lower boost at 0.7bar prevented it from seeing/activating the fault condition.
See if you can boz a green MAF from someone. I used to have a good one here, but sold it when I packed up the mapping.
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