The reason for all of my questions is that I suspect the cells are not balanced and that is causing the OV at the end of the charge. If the BMS has a high balance current, that might correct itself over time, but I would guess the balance current is not very large. Consequently, the BMS may take an extremely long time to bring them in line.
There are many ways to top balance cells, but since the cells are already built into a battery, several of them may be difficult or impossible. Consequently, the best way to get the cells balanced is to get the BMS to balance more of the time (not just when charging). By letting the BMS Ballance over-night while there is no charging, it should bring the cells in line. They may not be fully balanced yet, but they will be much closer. You might find that after a few days, the OV will go away. At that point you can change the BMS settings back to the factory setting.
One more question: Can you tell what the cell over-voltage limit is set to? We may want to set the limit to 3.65 for the above process and once things are balanced take it back down to 3.6 or maybe even lower. (I like to top balance to a voltage slightly higher than I plan to operate the cells)
Here are a couple of videos that talk about some of this stuff for a different model battery: