You can easily farm for the book as of now. All you have to do is run into DM W alone and skip the wandering trees, see if the book or a chest is at the end surrounded by some trees standing there, charge in, use intimidating shout, loot and run out. Reset the instance with a guildie, rinse and repeat.
I notice you are set up quite nicely for PvE, I went the opposite route of getting all my PvP gear.