Dude! I was going to post yesterday but got busy. Turned out mine had the original orange flapper from my intake's check valve stuck in the other check valve at the turbo inlet! So it couldn't pass enough positive crankcase pressure under high boost. Cleared it out and boom, no more smoke after let off. Sounds like the same problem you had. I saw that PCV fix you did on YouTube, I was contemplating it. Maybe in the future when I get the meth injection and turn the boost up more.