I believe clearing the Relearn_Flag is done by setting EDV2 to your fully discharge parameter. In my case I'm setting it to 8.5V. The trick I had was with using the EV2000-60 software. When selecting NiMH there are two registers to set which are EDV C0 Factor and EDV C1 Factor. Above those two registers is a greyed out text box which shows C0 + 2048*C1 which updates after C0 and C1 are written to the EEPROM and then read back.
In my case I have to set C0 to 308 and C1 to 4 to obtain 8500mV.
Not sure about my second question.