Instead of discharging the pack at 20 amps to 5.4 volts, discharge it to 6.0 volts or even a little higher, THEN use the Smart Tray on them
Ttso doesn't want to use another discharger, that's why he's trying to mod his SmartTray, but I use charlie's method all the time.
Keep us posted on your mod, Ttso, it'd be great if you get it to work.