Problem is not the PCV Valve in most boosted engine cases IF you use a GM valve.
The GM valve seals against itself (if it sees manifold pressure (boost)). That function was put in place by GM Engineers for Backfire Protection so that a backfire could not catch the oil pan on fire. No clue how the supra valve works.
Your issues are most likely from not using a GM designed Baffled Valley pan. The race stuff typically does less of a good job in that area vs the stock stuff.
You will get oil and fumes out of the steel mesh breathers under boost because the rings never seal perfectly under boost or otherwise.
Talk to Charlie66 as he has been down that path and will have some good suggestions for you.
Tom V.
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"Engineers do stuff for reasons" Tom Vaught
Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward.
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