My car is a Version 3 (if that is what he meant), mate the issue you are having is that the DV fitted to your car is not allowing sufficient air out of the charge system quick enough so it is taking the path of least resistance which in your case is back out through the compressor of the turbo, which is what that god awful judder is caused by, if you have any doubts mate you are wecome to try my DV on your car and you will see how much smoother it is.
The Forge DV's are very good its just the one you have fitted is no good for your setup.
Cheers Iain