It's not a performance enahncing device it just tricks the ecu into thinking your running less boost hence you can sail past 13 psi (factory fuel cut) without hitting fuel cut. If your raising boost above this then you really should have some supporting mods, uprated pump and Fuel Pressure Regulator at a minimum.
You need to have the FCD on setting 8 to get it to work properly, your only running 0.7 bar so you don't even need it
Kind Regards,
Toby