Have you tried charging that low cell by itself through the balance taps? If you can bring it back up to 4.2 then see how it retains voltage after a run. The pack may not be a total loss, it may just have been assembled with a non-fully charged cell initially. Yes, that's MA's fault but it can be fixed. Do the same with the other, better balanced pack. I'd keep it to a 1A charge through the taps, and don't forget to set the charger to 1 cell. If it doesn't work out then I'll let MA handle it from here.
