Well, I'm going to punt about the hissing and just live with it. I've taken it apart twice and cleaned all of the fittings, did the "soapy water" thing looking for leaks, listened intently with a stethoscope and make sure the PCV barb was not restricted (I didn't drill it out, and don't intend to, either). It is what it is. The can is working well, so I'm gonna quit worrying about it and move on to other things.
Here's what the can has collected in two weeks. The weather has been cold here, so the condensate looks muddy, but the crankcase oil is clean, so I'm not concerned:
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