The car needs to be run on a rolling road dyno. The ignition timing needs to be adjusted by someone who knows what they are doing.
Do you have a wideband Lambda sensor?
Set the AFR's first! 11.0:1 at peak boost (peak torque) dropping to 10.5:1 above 6000rpm for safety, 14.5:1 - 15.0:1 at low throttle cruise (off boost), 13.8:1 at idle.
Ignition timing - start with the PFC base map - check that the knock index is below 30 when running the base map. If not reduce the timing in the cells that are knocking by 3 degrees before doing anything else. advance the high load cells by 1 degree at a time until you have a knock spike to 40 - then reduce the timing by 2 degrees (or more) until you see a maximum knock index of 30 again.
This is the timing map of my current PFC tune (ignore the fuel map on the left it is for 440cc injectors):
I run 1.6bar of boost on these timings so it should be a good place to start with your Ej20g.