The question is, is this banding a result of the display or in the document? I suspect the later if you're dealing with raw data. That's an issue with poor(er) quality display systems that don't produce anything close to 8-bits per color let alone more than that. Always examine this in Develop at 1:1 or greater too. You can't properly evaluate this kind of data quality in the other modules, they use a different preview quality and architecture.