this one pack out of 6 is the only one acting this way the other 5 take about 4900 we charge on a tp610c and I think he has tried charging it with the balancer, our packs are all promatch its all we use.
Cell imbalance can be masked as reduced capacity , but the trouble/risk/problem is more serious than just reduced capacity. The answer is normally to evauate the pack and label or treat it appropriately.
Are all these packs being run in the same vehicle with the same ESC. If not, you may have different LVC in the different ESCs. I have never had a 5000 take as much as 4900 when it cut off. That doesn't sound right to me (IMO).