If your car has an adjustable wastegate actuator and no lines are hooked to the factory wg solenoid, then someone has probably hooked your vacuum line up "Tuner style." Meaning there should be a vacuum line plumbed from the compressor cover on the turbo, straight to the wastegate actuators vacuum port. With no line running to the wg solenoid, boost is being controlled by the length of the wastegate actuators adjustment rod. Typically whenever new turbos were built at PTE and they included the adjustable actuator, the guys would run a hose from the compressor cover, straight to the actuator. At least they used to.
Just a thought.
Patrick