misguidance. that's 1.2% including everyone who doesn't have the darkmoon book in their bag. The drop rate is way higher than that.
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OP, here's what you do every month. -> Two of the drops are easy-easy to get, the last two take some time. Go for the first two, then if you have time, go for the second two.
Queue specifically for stockades and Wailing Caverns. If its Stocks, do the whole thing, but avoid the fire boss if you can as avoiding it obviously saves time. If its WC, go straight to Lady Anacondra. Once you kill her, drop out of the dungeon. For whatever reason, I've never got that penalty debuff after dropping at this point (not sure why).
Not sure what your spec is, but as a tank, that's 10 minutes for shots at both of those items. (non-tanks obviously take longer as their queue times are longer)
Once you get those two, then its time to start farming the two that take more time as you have to run all the way through SFK and BFD. Depending on the group, BFD can take forever...especially if you're a Druid tank and no one wants to deal with your agro problems.