Think I found the one that controls the 80%+ down ramp. There actually IS a down ramp now!!! Before it would just jamb a full 20 amps right up to shut off if I allowed it. In most cases I couldn't because several cells would pass 3.8V if I did. Needless to say, when the charger is pushing 20 amps its not possible for the BMS to keep up. Now it gently drops down under 1 amp and the separate BMS burn off module can actually control the high cells and keep them from going beyond 3.8V. It might actually be a little low right now but I'll gradually bring it up manually until all the burn off lights come on. Probably will take a while though.
Another nice feature is I can turn the max charging current down too. Now I can actually charge the car AND have the main shop lights on at the same time
Still have to figure out the last one. Maybe thats what controls the final shut off?
What a relief!! Up to this point I had to constantly baby sit the charger for fear of overcharging some of the cells.