Rebalancing, possibly.
I had another thought though:
Don't forget that the other thing my pack analysis did was cycle the sticks fully and recover "lost" capacity (at the expense of some cycle life). The dis/charge currents during cycling were quite a bit higher than the grid trickle charger/balancer: 10 & 7 A respectively, vs. 350 mA.
This is why Robert Smalls encourages occasional "hard" exercising of the pack in his excellent thread:
http://ecomodder.com/forum/showthrea...vic-13610.html