The best chargers balance the packs in parallel while charging. They discharge high cells while the charger is charging simultanesouly. This way no one gets left behind. Ideally charging the cells individually would be the best way to go, but would take forever becuase of the small balance lead (they only handle 1 or 2 amps).
You have a problem I had with a new pack I bought from overseas recently. Discharge balancing will probaly not work, the low cell needs to be brought up to the voltage of the other 3 cells. I tried to discharge balance the low cell, but that did not work, the cell was too low so the balancer would shut off before all 4 cells matched. Cutoff voltage is not programable , probably a safety feature which is why...I rigged up a single cell charger to bring the low cell up, a better way to go, but you better know what you are doing. Youv'e been warned.
It took a few cycles of charging the cell individually then balancing before the pack was matched well.