I think the fact that you have it returning after the airflow meter is a good thing, because you're preventing it from spitting oil on the AFM that night be coming from the turbo. Also I'm not sure, but I think the extra air from that might have affected the AFM readings had it purged infrom of it...

Your BOV does look a little small though, it might not completely have the desired effect of protecting the turbo from pressure build up in the system, when the throttle closes.