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If it's any help, my M235 6MT exhibits some mild differential "bumping" or slack when letting off the throttle, typically at 60-65mph in 6th. It can occur in other situations, but that's the most noticeable situation. I've noticed this issue in many other RWD and AWD cars. Some worse than others. I haven't bothered having BMW look into it because I'm certain it's normal and nothing can be done with OEM parts. I'm sure you can quell the issue with much stiffer bushings, etc. but then you'll create a whole slew of other NVH issues.
My guess is the sound/sensation in the M2 could be more prevalent because the M2 runs much stiffer rear subframe bushings. I believe they're straight metal and not rubber filled like on the M235. That will certainly increase NVH and is the price you pay for running racecar-like parts on the street. It's a compromise.
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