I think I had a similar noise happen last year with mine. Came on around fall/winter and, like you, tightened everything, took it in, etc. Dealer told me it was the brakes and they creak on this car...but I didn't feel like that was it since it happened when I accel/decel without brakes. Mine ended up just going away after a few months.
I still do have a clunk when reversing to the left that I or shops cannot figure out. Only happens when I back into my driveway. Still there even after the control arm SIB.
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2014 X5 50i
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