FD post kunark worked like this:
on STATIC mobs: mob would 100% forget about you once it returned to its home point.
on roaming mobs: mobs had a 25% chance to fully forget about you
All mobs while they are roaming back: 25% chance to forget about you.
Some people believed that when mobs were roaming back, your chance to FD them off increased the more times you FD'ed. IE, 2 FD's = 50% chance, but i never believed this was accurate.
Garibaldi <Transatlantic Rampage>
Shiishio <Pandemonium> - Tallon Zek - 65 Monkey