I have no idea. Why don't you search and read the various threads on the topic to find out?
I recently specced 21/50/00 on Live with the recommended Glyphs in OP. I used IT BS FS OB FS OB FS as my rotation and was doing 2.5k on Heroic Test Dummy w/ HoW up. Does that seem about right? Is my expertise killing me?
HB seems lethal on trash to me. What kind of rotation do I want to use on trash? I've been playing Unholy for a while, but Frost seems even stronger on trash.