For my 100% SOC charges, most of them included a immediate drive. Some didnt really even stop charging self before I drove. Once my wife needed the car at 100% and I was not nearby so I did set it to charge to 100% and she left ~ 1 hour after the charged was completed.Have you left the car sleeping to invoke OCV when at 100%? Or you drove it directly to under 55%.
And when at 0% have you left the car sleeping some hour?
( I do not think there is a big need for the BMS to see the 100% SOC at OVC as it is a well defined end point of charging, reaching 4.20V/ cell and have a predefined currebt as the stop charge level.)
I did one in the end of last summer, down to 0.39% and the car got a decent sleep with that SOC.
I have made two low SOC this year, down to cirka -2%. Both times the car got to sleep a few hours, and both times the NFP shifted down precisely as I hoped(as I was quite sure that the NFP was overestimated).
After the first time the NFP climbed back to the before value, 80.5kWh.
The second time was quite recently, and after that the car have been doing more big cycles than the usual 55% charge level, due to a new job and some trips from my wife.
The NFP is steady at around 79 now.
I did a drive down to zero (0.40%) and charged (SuC) up to 100% charge during a trip home, to get a number of the charge session Immediate charge at arrival, and did not sit until it stopped.
(Before: Nominal remaining 3.80
After: Nominal remaining 79.0 kWh
Charged 75.4 kWh).
This did strengthen my believe about my battery capacity is 79 kWh today which is in pair with my calculations from average SOC, average cell temp and average cycles etc.