I have the augs from ToV and I've been spending what little EQ time I've had hunting down the group aug from TBL. I've killed many, many named in Meratas and Aalishai along with a decent amount of trash. I've gotten at LEAST 2 of each aug (5+ of some, I'm sure). I'm yet to see the group accuracy aug drop. I've not done much research, so I'll just ask: Is there any rhyme or reason to their drop location? Is it just random?
From my experience, random. The page from Magelo doesn't really help: Whispering Midnight Attacker - Augmentation - Items - Database - EQ - Magelo Don't forget that GMM can drop the 18/19s as well.
@Minimind Like the others said, completely random. BUT I have seen it drop most in Maeratas.. took me a solid year to get that one between losing rolls, logging too soon and then it drops for my group I was in. But kill trash too, don't stick to just the namers. Good luck! I would help if I was on Luclin