I wouldn't be saying its buggerd
Mine used to do this with the catch can just venting to atmo of the rocker covers
I used to run my oil level quite high due to me having a remote mount filter and not wanting to encounter oil surge around corners
By running my oil level high, and the catch can to atmo, it would blow smoke at idle, like you I thought it was turbo, as the compression was fine, so I replaced the turbo. Problem still there...
I then connected my PCV setup back to stock and drove it like that for a few days, problem went away.
There was minimal amount of oil in the intake, so I decided to retain the stock PCV setup, but add a closed catch can between the right hand take off point on the cam cover and the intake. This filters the air (consits of a catch can with steel wool stuffed in a stocking) before it gets to the intake.
By running it this way, the PCV valve can do its job at idle and off boost, and keep the crankcase gases to a minimum, but once its on boost, it goes though the filtered catch can and into the inlet.
By running it this way, there are no smelly catch can fumes, no smoke at idle, and clean intake and cooler pipes. It really just improves the stock setup, it doesn't alter it in a major way
Fixed my problem, that was almost 80,000kms ago and its still going good, just need to change the filter setup every 3 months or so
I run around 1.3bar daily and it works well. I find the first time it boosts up a bit of shit come out the exhaust, mainly just crap that can't get blown out until its at full noise
My oil level is always within about 50-60mls of whatever I put in when I dump it, so there isn't a issue with broken pistons etc.
Maybe a little wear and tear, I guess after 165,000kms of a pretty hard life, I'd expect that
If you need anymore info let me know, I can send you a few pics of how mine is setup
Chris