I don't know the specifics of your engine ... but the way PCV normally works is to suck oily vapours into the intake air-stream BEFORE the throttle-body. Which is the piping you're describing.
So when there's a decent amount of oily vapour getting into the overall PCV system, yeah there can be some oil on the insides of the air-intake system prior to the throttle-body. That's fairly normal, what's not normal is there being a HEAP of it, but the definition of "too much" does depend on the engine, some engines just need that stuff cleaned out every few years.
I mustard mitt I know nothing about the brake booster related stuff you're describing, the booster gets it's vacuum AFTER the throttle body (ie. normally inside the plenum) so the hoses/connections you describe might just be a way for an over-vacuumed brake booster to be able to get filtered air that's not under vacuum yet ... ?
PCV is the name of an entire system, when you say you "replaced the PVC" what part or parts in particular did you replace?
What engine is this? [I'm a clueless noob but the answer to this might help the cluey people 'round here answer your Q's from a knowledgeable viewpoint]
