8 on tickover jesus are you trying to drain the oil reserves!!
This is more than choke, very doubtful if CO pot willl adjust this much at all.
Power is not standard it is stage one, look at chip and -31 actuator on turbo.
Either the r/r figures are out or something else is as it will not hit 270@11psi.
The idle CO is adjustable on car without removal of ECM(ECU), there is a small screw at the side of the ECM to adjust COUNTER CLOCKWISE FOR LEAN,
if this does not bring it down suffeciently look at wiring and replace the CTS, or coolant temperature sensor, at rear of block passenger side with two pin connector going to it, this is THE THING THAT DECIDES the CO, idle is just a trim, the CTS is the main governing factor for emmisions, and what the chip or map in it refers to.
tabetha