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Good stuff man, is your catch can full??
When under boost and with the ccv valve in place you have to think about where the 'pressure' inside the valve cover goes.
And when you go from boost to vacuum it may just be sucking in all that blowby stuff??
What type of smoke did you see on dyno? oil smoke or maybe just rich fuel smoke??
Oil feed to turbo can cause smoke too, do you have a restrictor in the feed line? 1-1.5mm? And turbo drain too but NO restrictions. I had a RB30det where the oil actually sloshed up the drain which blocked the draining oil from turbo and smoked terribly from the exhaust.

just some thoughts...
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