mazda 6 2006 diesel

good evening all. mazda diesel, had dpf removed and deleted using GEN7 software (apparntly undectable for when vosa start plugging ur car in at mot time). and I have still got low power(boost). I can hear turbo whistle, ticks over great, a bit more responsive when I feather throttle through rev range. dirty diesel fuel, egr,? baro sensor(boost) reads fine with live data. maf been changed. any Ideas please!!