To save anyone from wasted effort, to have a conversation with Ain Greid there is Knowledge of History II requirement (I'm not at the NPC to double check but it is either 4 or 8 pieces of knowledge to unlock the conversation)
I can confirm this, it unlocked after History II.
Got low interest and low favor, try this: Legend of Edana, Kzarka and Bareeds, Black Energy and Ancient Cultivation, Barbarian Occupied Mine.
It's a gamble, but if it goes well; high Favor (100-146ish)