I can't really confirm or Deny your modification, but I have some tips maybe.
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. This method seems to prevent the weakest cells from being over discharged during the main discharge. Also, if you "up" the current, the voltage cuttoff will not be as accurate as the load is higher.
Thanks