Chris

The valve lift is between 0.3mm at idle to 9.5mm at higher RPM/load with an engine starting valve lift of 1.7mm.

Where on a convential engine 'Live data' reading will as you know produce reading around 300mbar

On this engine at idle with a valve lift of 0.3mm and the throttle almost fully open you should get a 'live data' reading of 950mbar as you have.

I believe this 50mbar pressure difference across the throttle flap is needed to encourage EVAP and as you stated crankcase recirc.

Also I have some notes I have written for myself stressing that the 50mbar pressure drop across the throttle is closely monitored and any higher will set a fault code.

As I said earlier I do not want to lead you down the wrong path and I haven't had time to research your fault code but the description sounds something similar to what I have tried to describes above?

hth
James