The capacity and charge current should be independent, as the capacity is only used to shut off the charger (normally) for safety reasons.
The voltage readings are different due to the point at which the charger monitors the voltage, the pack voltage is done at the output of the charger and the balance at the end of the balance leads. If you put a DVM on the cells whilst charging you normally get a different reading to that of the charger. Only chargers with sense leads (old eagle CDC) or calibrated (protrak) give an more accurate reading at the end of the charge leads.
As for the charge taking so long, how soon does it reach 8.4V? From that point it's in constant voltage mode and dropping the current all of the time to maintain the voltage. If it spends ages charging at 0.1A and not really putting much juice into the cells that might be where all of the time is going. Some of the 4 button chargers have a fast charge mode where the constant voltage phase isn't held for so long, i.e. you get a good enough charge without waiting for every last milliamp to go into the cells. If yours has that, try it and see if it improves things.
Ian
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