@Oldman2 Thats the problem with looking at individual battery SOC, it lies, it makes it up and its not accurate, which is why I love my Victron Lynx shunt, that's my point of truth.
The two BMS's can be wildly different from each other and the shunt, sometimes they are in sync, most times they are not and these days I have no idea unless I look on the app, as both BMS screens have stopped working, but its a common thing that BMS's don't calculate SOC charge very well.
Currently they are 81% and 84% whilst the Victron system reports 86%, so pretty close. Ones at 53.2v and the other 53.07v.
The biggest problem is they don't measure low levels of current very well, so the SOC charge will drift, and often they don't have a very good way of resetting to 100% either, so they never reset.
If all your individual batteries are very close on voltage, and the current they are drawing is very close then they are probably all about the same SOC.