https://www.youtube.com/watch?v=OkY9...ature=youtu.be
A few years back when maxing Halas faction...
I had to farm 200 stacks of gnoll fangs for turn-ins (about two weeks of late night off-peak hours when BB was empty) and it ended up bringing me from 40% of 59 to just shy of level 60 (99.99% - I later hit 60 doing bone chips/milk maxing NFP/Dismal Rage).
Halas gives the same XP as Qeynos, a bit more coin and no negative faction hits.