I would rather change the
"
[GeneralEngineData]
fuel_flow_scalar=
"
in aircraft.cfg to let it match realworld data rather than reverse.

But that takes quite some test flight and time consuming.

Also due to the fact of the fuel flow not constantly higher or lower on all condition, I'll also go to change other parameters that makes it more complex. so I think that's what CS should do rather than me.

Right now I have self-edited ".air" file for both EPR and fuel_flow match, that's rather complex but works slightly better.