The two banks should be similar. I don't remember how much change at idle. I have M54 engine and have watched the cam position over time while using cruise control and it's fairly predicable.
I would take a test drive and monitor with cruise. If you can plot a graph of both intake angle that would be very helpful. If one is more erratic that will help you track down the problem.
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2011 E70 • N55 (me)
2012 E70 • N63 (wife)
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