I discovered a detail in the PCV system that I left out of my diagrams (and I had no idea it existed until now).
The small OEM emissions hose that connects the PCV valve to the intake plenum has a restrictor in it as well. The opening is quite small, maybe 1.5mm or so. I will have pictures in a bit, and will update the diagrams to reflect this soon.
I believe the restrictor is there for the same reason the other restrictor is there, to prevent a run-away idle situation where air is brought into the plenum through the valve cover from the intake pipe (by-passing the throttle body in a convoluted pathway during high vacuum situations).
The restrictors themselves seem counter productive to me when you think about the kind of flow you want in a PCV system. I've removed the restrictor in the WOT section on my engine with no ill effects to idle that I can tell. That might be the case only because I still have this other restrictor in place. I'd be very curious to see what would happen if this other restrictor is removed, and I might try that on my engine. I also wonder about those out there who have replaced this hose with one without a restrictor not knowing that it was there to begin with. I wonder if they have experienced high idle issues or problems with too much vacuum in the crankcase.
I'm just glad that when I replaced my cracked PCV hose I insisted on getting a new OEM one. Otherwise I'd never have known it was there.
Images of this restrictor can be found in this album.