I agree that can be very powerfull on static encounters. but i didnt liked it ... used on my last ulduar (still using 4tier8) and my dps went up on some encounters but really down on others. With the HB glyph i feel much more confortable and im usually toppng meters on most the encounters.
The most important thing on that rotation is using the death runes on icy touches and dont waste the MAAAANNNYYY procs on them but on the frost strikes ... Maybe when u are really confortable with the rotations its a really good specc ... but i preefer paying more attention to the encounter itself, i could loose some dps but alive dps is better dpser.
My thoughts
So you're running single disease HB glyph? in Blood pres? And you didnt fint IT6 to blow it away in every aspect?
Either you're doing something wrong with It6 or I did something wrong as HB blood pres for 2 weeks.
The best way to start is IT BS BS OB [BT] OB
no, that dosen't set your runes up good enough, you end up using ITs on slot 6 Death and it messes everything up. timing your runes is absolutely critical with this spec.
The most effective way to start is IT BS OB FS, BT, IT FS OB FS.
this lets your FU pairs come up far away from each other. You then use a blood strike on one death to refresh again as death so you always have 1d and 1b coming up as to more evenly spread RP gen and avoid dead time in your rotation.
Fluidity is key with this spec. you have no Rotation or Priority system, you simply try to put as much time between your FU pairs as possible and use KM on FSs when you can.