I am guessing its the same cells out of whack all the time? That is a greater than .1 volt difference. I think that qualifies for a trip to the dealer. Another thing you could try is charging to 50-60% and let it sit 3-4 days if possible to see if that helps. Balancing happens all the time so the only reason for top end balancing is for greater range and the range improvment would only be a few miles at most.
On my 2018, I have a few outlier cells but not to that extreme but have only done 15 full charges including only 3 in last 3 months. Nothing to worry about since the range is sufficient and the risk of a high SOC far outweighs my desire to have a better balanced pack
Yes, same cells all the time. Keeping charge at 50% is hard, it's constantly in use. My daily usage on average at or slightly above 50% and I really doubt the dealer will respond to data from anything but official Nissan tools.
Thank you for advice though.