Since the issue is only showing on one bank, spark plugs have been replaced, coils are good, air is getting in an out, and fuel pressure is OK on the other bank, I think we have narrowed it down to fuel mixture controls that are on 1 bank.

I don't recall that you replaced any O2 sensors so that could be the problem or there could be a vacuum leak on that bank that has not yet been discovered. There are other possible causes but IMO, not as likely. Next step, I would confirm the O2 sensors on that bank are working properly though either possibility could have been the core cause.

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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas