No but I'm using an active balancer and the cells are almost perfectly balance. I've read thought the BMS document a few times and just can't figure it out. How does the BMS know's when the battery is fully charged? Is it using the amount of Amp Hours going in and out?did you top balance you pack before putting it in ?
if the difference is too great the passive balancing will take a bunch of cycle to catch up.
realy only thing i can think off, cells too unbalanced