I think that if you are using Power Fc to control boost with the stock boost solenoid, you need to have the little brass olive in place to control the flow of air to the solenoid and thus the wastegate actuator.

Feel the vacuum line coming off the little nipple on the compressor housing of the turbo. Squeeze down alone the hose to feel if there is a hard bit. It should be between the nipple outlet and the T piece. If there is none, no matter what setting you use with the Power FC hand controller it will always run wastegate spring pressure.

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RS Liberty - Because WRX's are only good for parts...