Another approach besides adjusting the termination Voltage is setting the balance speed to slow. Turning balance trickle on should help more.
For balance charging Lithium batteries. If the Bal. Speed is set to Fast, the
CV termination current will be higher, the charging time shorter and the
per-cell voltage lower. When set to Slow, the CV termination current will be
lower, the charging time longer and the per-cell voltage higher. The default
value of Normal is between the Fast and the Slow. If Bal. Trickle is ON, the
iCharger won‘t stop charging until the current falls to around 20mA.
Bal.Speed: Fast, Normal & Slow, (Normal, default).
Bal.Trickle: OFF & ON: (OFF, default)