Bypass the AOS and recheck. Put a plug in the intake side where the hose goes into the intake. reroute hose to a container or vent to atmosphere with clean rag to contain spillage or forced oil. Do not seal off this end! Drive like this a while to see if symptoms come back. This is not a fix just a way to drive car home after a AOS is busted or to test the system to see what area the oil is coming from.
Even though you may think the AOS is good this will tell you if the oil is coming from the AOS because it is forced out here due to blowby or other means.
Bypassing the AOS valve Air Oil Separator on a Porsche Boxster - YouTube
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