The AGU ecu works out the boost in terms of load, basedon maths mathmatics displacment, air maf drawn and intake temp = peak cylinder load or cylinder filling in *ms. An over reading maf scale will can read as too much boost/load or a AIT sensor fault will offset the readings and still cause overload reading.
The upper limit load cap in our k03s aug maps is set to 11.5ms and the MAF drawn limit id maxxed out.
Do an excell log of the requested boost and actual boost, and maf and post them up, plus make a note of the intake temps.
Nick