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I think you have to disable the valvetronic if you are to test the PCV via the 'oil cap method'.
As you have checked for leaks and the valve seals look fine, the PCV system would be the prime suspect (the B30 does not have the worn oil scraper rings problems like the B25 version). Unless money is an issue, i would replace it and see if the oil consumption decreases before digging too deep.
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