Are you charging using Gen, Solar, or Grid?
If it is Gen or Grid, I believe you can set those to charge based on Voltage - PV no such luck.
One thing to note, when I switched from Bat type 0 to bat type 1 it did help "some" with my drift. I went from 7-8 percent to 2-3 percent.
I have also noticed that during the summer when I am getting good solar, the batteries will top to 100 on one and 99 on the other, the BMS will shut down charging and then after a while the batteries will balance and the BMS will accept charging again eventually both balancing to 100%.
It seems that the process takes about an hour or two after a "full" charge has been done.