Yes, it is on torque pro. If the overall charge voltage has to be constant for cell balancing, then no. But it does appear that individual cells are getting more or less current depending on their cell-level voltage. For instance, I have approximately 10 cell groups that are consistently .01 V lower than all of the other cell groups; however, during this phase, they can reach parity or drop to as much as .02 V lower than the other cell groups.
Whatever is going on during that phase of the charge curve, it looks different than the other phases of the charge curve.
I would be amazed if GM was actively balancing cells at anywhere other than full charge. It would require, basically, another complete BMS.
If this is actually a group of ten cells you are looking at, it may be a complete module. The cells are arranged:
cells 1-10, module #1 , temp thermistor #1
cells 11-20, module #2 , temp thermistor #2
cells 21-30, module #3 , no temp thermistor
cells 31-40, module #4 , no temp thermistor
cells 41-48, module #5 , temp thermistor #3 (module #5 has only 8 cells)
cells 49-58, module #6 , temp thermistor #4
cells 59-66, module #7 , no temp thermistor (module #7 has only 8 cells)
cells 67-76, module #8 , temp thermistor #5
cells 77-86m module #9 , no temp thermistor
cells 87-96, module #10, temp thermistor #6
Module #5 and module #6 are up under the rear seat. When the car sits for a period of time, without coolant circulation, you will see these two modules sit at a higher temp than the others. During coolant circulation this is not the case. Then, modules #1 and #10 are often the hottest.