Because of the low idle-vacuum, the PCV thinks the vwhicle is accelerating briskly. IMO,It is doing exactly what it was designed to do. IMO fix the low idle vacuum and all yor problems will go away
Part of the low idle vacuum is the PCV transitioning at the wrong vacuum level for the cam. The plain-jane stock Mopar PCV was designed for an engine setup that idles at around 20" of vacuum, not one that idles around 11-13" of vacuum.
GM (as one example) changed their PCV's as a matter of design when they put moderate cams in production cars. That is where the FV191 comes from: a 70's production GM cammed up 'hot rod' engine. Now I am curious if something like the early 340's came with a different PCV than the plain-jane ones.