W203 mercedes c32 supercharged (fuel starving)

Salaam to all..

I am tuning mercedes w203 c32 amg modified with 56 sc pully + 440 fuel injectors + headers + intercooler and johnson sc pump.

I am using Ecm titanuem for tweak fuel and ignition, Unfortantly many fuel tables lack so i am not able to sort fuel starving at partial load 1200 rpm-2300 rpm afr goes 15-16 beside getting heavy knock at the same load, tried pulle some Timing but knock still there.

Any suggetions?