Just a tip. Iirc, you can also randomly get Gate of Purgatory 3 from ACV MO quests reward. Since it's quite hard to spam kill the anti-visitor golems(meaning, resetting the dungeon) in HKT, i'd suggest do ACV MOs too. At level 60-66 you can simultaneously do both ACV and HKT, and do take note that ACV leeches on Quill are quite 'popular' nowadays.
Quill/7x/DMN/4x/RNGR/ 'What happens to a dream deferred?'