The new graphs still look wrong. The reference pressure (yellow line) is the pressure that the ECU wants to see out of the turbo, which is between 1000 and 1500 mBar (normal). The black line is the signal to the wategate control valve, which is topping out trying to give maximum boost. The blue line is the actual measured boost which is sitting around 1000 to 1200 mBar, and nothing like the shape of the yellow line. Where the blue line does peak a little is probably where the throttle is closed with the engine revving and the airflow to the manifold is shut off.
The video you have linked is for a diesel engine, but the principal is similar. You can see the vacuum hose to the wastegate actuator here:
You can see here (under the turbo) the control rod that goes from the actuator to the wastegate itself:
With the engine cold (so you don't burn yourself) you should be able to feel the rod moving when the throttle is blipped.
I am surprised that you are not getting fault codes for under-boost.
