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if I were running an exhaust driven PCV system without monitoring, I would incorporate a check-valve breather, such that during boost the system would default to open atmospheric (no pcv action) if there were any pressure, since I would also be using a quiet exhaust system (probably high back pressure). Back to normal driving and the exhaust driven system does the crankcase vacuum as if it were on the intake manifold, this way oil would never see the intake valves no matter what and any positive pressure that the exhaust driven setup couldn't deal with would exit via check valve (because I weren't monitoring it to know for sure). There is a guy on LS-1 tech "Mighty Mouse" promoting a similar setup, and after considering it, I agree this is a fair compromise on a high performance engine without crankcase monitoring refinement.
Oil may be collecting during normal driving, and none during WOT. Without a gauge on the crankcase, there is no way to monitor what is really happening. Also, oil vapor (as single, gas state molecules) might work its way into a tube and collect there (hydrophobic interactions) without any help from pcv systems (could be at any pressure around atmospheric).
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