Does your rocker cover have a baffle installed?
I run those crappy thin pressed moroso covers and I ripped a breather baffle out of a stock sbc steel pressed rocker cover and rivited it into the moroso cover for mine, mine doesn't suck oil.
You could also try putting an inline fuel filter in the PCV hose, that should trap it. Dont know how long before it would become saturated though. Haven't tried it but I heard that Grumpy Jenkins had.