Initial parameters
BMS : OV cell protec : 3. 65 (datasheet) / OV batt protec : 28.4V
Solar CHARGER : absorption 28.4V and float voltage 27V.
When the solar switches from bulk to absorption, the cells start to unbalance. So, I decided to unpack the battery to do a balance. I don't think that is a top balance as every single cell was not fully charge. After this balance, each cell was at 3. 41V.
You said you balanced them. How did you balance them?