That much of an inbalance is typical of a dead cell but it's improbable for all your packs to die at once. A quick way to check though is to hook the pack up to someone else's charger at the track - if they show up after a run that imbalanced on a "neutral" charger it's probably the batteries.

Is the issue the same on both balance ports on your Hitech or is it limited to one side of the charger?