white scooby

Had my car on the rolling road at well lane yesterday, and the fuelling is all over the place they said. Something about its only making 3.3% at full throttle and should be doing bout 6-8%. Running a blitz filter and nur spec r exhaust apexi avcr boost control and s afc air flow. Anyone got any ideas as to how to sort it. They said its not got any det/knock yet but their suprised its not??

my00 uk turbo - making 265 bhp and 220lb ft