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From OP "... The PCV system is connected to the intake in 2 places: before and after the turbo -- so there is always a source of vacuum available. A simple one-way valve on each of these routes ensures that air can only flow out of the crankcase, never in...."
You replaced the PCV valve, but from the OP's pictures and description, N55 valve cover has also 2 one-way valves (check valves). Those probably were not sealing when they needed to also, or were stuck sealed when they should have opened. Cold vs warm may have been contributing how they misbehaved.
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