Ok i stumbled upon this last night with a heroic group for violet hold. We started it and we killed all mobs and sich and then for some reason we wiped on 2nd boss. So we had to start over and we got rep again from killing all the waves and the first boss - 250 rep. So if you want a quick way to farm rep with your faction you should just get an elite group together and kill all waves up until last boss then zone out and start over. Violet hold goes reallly fast and bosses arent too tricky at all. SHould be looking at a good 3000 rep an hour idk tho. maybe more maybe less. Just an idea. Peace