I've done a lot of work to come off blood and onto DW and here is my advice:
Dont forget D&D, you always need this if you are going to hold AE threat from some 5300 gearscore high end DPS. I run HB, RS and D&D glyphs in this configuration. (
http://www.wowarmory.com/character-t...pany+of+Heroes). For AE fights you D&D and this should gather everyone, then drop your HB & BB, you can tap for another BB here if you need to but I have my tap bound to my UBA and typically hang onto it. Next rotation is just OB/BB and HB when it free procs.
For single target I need epidemic and the two diseases to help me hold threat from some of the classes with no aggro dump. It seems completely asinine (and it is, to me it warrants two specs but I have room for only one) but this setup holds the most threat. I am not generating a ton of runic power, so I am thinking of dumping epidemic for 3/3 scent of blood but it would really hurt my single target rotation so I am very hesitant to do this.
You don't NEED Morbidity to make this work, but if you don't have it your ability to sustain AOE threat in long fights with lots of adds coming in is hurt so bad that you feel as though you have no control (you dont!)