If you have oil in the inlet and the Turbo is definitely good then yes it must be carrying over from the breather system. I would guess that there is probably nothing wrong with the breather and the reason for the carry over is high blow-by.
It could also be the valve guides and stem seals. Does your car smoke a lot when started after being sat for a while?
I'm in the same boat and I'm resigned to the fact I probably need a new engine.
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