Sounds/lookes like a dawes type valve and fitted the wrong way round i.e the more boost you provide the more is is closing the ball valve.
It need to be the other way round so the boost blows the valve open and bleeds some away from the actuator.
Looking at the picture and position of the adjustment, the ball/spring is in the top horizontal part. so you need to connect the turbo outlet the oposite end to the adjuster.
You may also find that the bottom of the 'T' outlet very small hole in it i.e about 0.5-1mm. This end should be actuator end. This is there to prevent boost spike..........my this takes me back to the days of Dawes valves, ScoobySport backboxes and 250BHP.....
what you have done by turning your pipes around is put it the correct way round, but by winding the adjustment right in the ball/spring valve is fully open, so the actuator is seeing little or no pressure hence the very quick and very dangerous boost spool.
Loosen the adjustment until the screw nearly falls out, then lock it off. Try it and the slowly increase the adjustment until you hit about 1.0bar, no more until you get the PFC mapped.
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