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So i've been reading a lot about BPV's and the issues with them.
I had some spare time on my hands so i though i'd be a good idea to check mine (car just crossed 50.000 km's today, so not really expecting stuff to be worn).
I took it out and this is the BPV before re-adjustment:
I turned the stop screw a bit out and the valve closed better:
So, maybe a good thing to check yours out even though you're not having issues.
Mine wasn't yo-yo-ing or losing boost.
I did notice a better pickup and my butt dyno registers a tiny bit more 'go'.