Just thought I would give an update now the pack has been on my bike for >7 months, time really does fly
Only bulk charged since initial cycling/balancing.
The worst pair of cells had dropped about about 4mV out of balance from the rest so insignificant considering 7 months but it was observed on the pack that got the pack with the highest self discharge which is still very low.
The matching of pairs of packs to get average self discharge levels must have helped.
I have just given everything a balance charge for the new year to ensure everything is in line so that the leaky group doesn't get more out of step. The charger didn't spend much time at all to balance the packs.
There is no sign of puffing on any packs ( I have not opened the cases but nothing obviously under tension). There is no significant loss of capacity noticeable on the bike but I haven't measured the capacity recently.
I'm actually being quite nice to the packs at 18A discharge on a 10Ah pack. I charge to 4.1V
NOTE: I regularly check the balance of the cells before bulk charging.
I will be adding some more packs and reconfiguring as a 12S 20Ah pack soon as the place I work for is moving our office to further away from my place. and I want to have some reserve capacity.