Zooming in on the video, I agree with Simon.
The DV almost seems to be working in reverse.
When at idle and when you open the throttle it should seal, when you come off the throttle it should open.
This will occur all the time there is a differential pressure/vacum between the engine side and the intercooler side i.e when on boost/driving and the throttle is open the pressure in the intercooler is the same as the pressure on the engine side therefore the DV is closed.
As soon as you close the throttle the pressure on the intercooler side remains due to the turbo still spinning and the pressure backing up against the closed throttle.
On the engine side as no turbo pressure can get through the closed thottle it goes into vacum.
Due to this pressure difference the dumpvalve opens, venting the excess pressure either back to the intake or to atmosphere (depending on valve).
The DV is mounted such that one side (where it bolts to the intercooler) is being moved by turbo pressure and the other side, the vacum hose uses engine pressure. All the time they are near equal in presssure there should be no movement of the DV.
The vacum hose should be connected to one of the 3 nipples on the middle of the intake manifold. make sure this is in the right place and has no weird hose joiners in it that could be on-way valves (thats the only thing I canthick of at the mo').
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