I pull negative 18-20 psi idle and its a 6.5" of mercury pv so I highly doubt its opening at idle. I checked it last night and it still held suction fine and the diaphram didn't look popped.

If I'm really rich at idle and really rich at cruise and close to being at the right a/f ratio under full throttle with 14psi of boost and stock size PCVRs, isn't that all indicative of too big main jets?

69 Buick Special Deluxe. Intercooled Turbo Chevy 250 @ 15psi on a stock long block. It's kinda fast.