Set right the charge controller will start charging before the BMS kicks in. THe BMS is for In Case of Emergency (ICE).
Set the charge to the Battlborn spec sheet, absorption and float.
If the BMS needs to be rest because of low voltage, look in the BB manual. THe reset may be automatic after charged enough. My experience right now is with a cheap BMS with no readings, and if that has tripped, I will unplug the panels and it resets the BMS. No instructions in my manual.
I have started using a better Overkill BMS, and that appears that the low voltage discharge resets automatically by shuts off at a per cell voltage I set it to and waits to recover to a higher voltage I set, and regardless has a set amount it waits.
Not sure what Battleborn does.