Dawes valve set up

[Rock Trol]

Hi everyone. I have just installed a HPD Dawes valve to my CRD Patrol to stop the over boosting caused by the new 3 inch exhaust. Two separate suppliers advised that I just isolate the solenoid and hook up the Dawes valve directly to the vacuum pump and then to the turbo. I do not have a needle valve installed.

This seems to be working fine on the patrol. I drove it around town as well on the open road (110 km) and boost was linear. It would spike up to 16-17psi and then settle down to 14psi on the highway. Around town its 10-12psi or lower when not under load. The question I have is that most of the diagrams I see still keep the factory vacuum solenoid or use a needle valve so are these rally needed? On my car its just the Dawes valve connected between the vacuum pump and turbo.

Here is a link to an earlier version of the HPD Boost controller. Would this be any different to the older style Dawes valve as the instructions say to just bypass the solenoid.
http://gcg.com.au/category/performan...troller-detail

Also, where should the dampener be placed? Between the turbo and valve (currently set this way) or the valve and vacuum pump? Or does it not matter?
Originally it was between the control solenoid and turbo.