What were the individual cell voltages. I have the same charger / power supply setup and I have had trouble with it not completely balancing packs. Even if they are very close (one cell at 4.20 and one at 4.19) it just keeps going and going and going. I have just started watching it and if the pack shows 8.4v and the cells are within .02v of each other I just stop the charge and run the pack. It has never caused any issues.