Finally got some quality time dpsing instead of tanking in Ulduar last night, here are some highlights:
Parse
XT - 6417 dps
Kologarn - 6109 dps
Auriaya - 5214 dps
Freya - 5488 dps
Hodir - 10,272 dps
This is with BP HB solo disease priority, Fallen Crusader, BoH, Awareness Sigil (DAMN YOU XT)
A week or so ago I was sitting ~5.5% hit and ~20 expertise unbuffed and I noticed that a good portion of the time my BP rotation would get wrenches thrown into it, so I preferred the IT/PS UP rotation. If there was a way to work in HB glyph and still have it be effective in UP I would, but sadly the only fight sofar that I've been able to top meters on while using HB rotation in UP was Yogg-Saron attempts (and the only fight where I consider it to be 100% necessary). Now that I'm at 7.26 or so hit unbuffed my rotation is much cleaner.
I do find that if I am inundated with Rime procs and extra RP from AMS soak I delay the use of my blood runes like some posters have suggested in this thread and that gets me back on track nicely. I see this as being especially important once you have the new sigil that makes FS even more amazing than it already is.
For me at this point in time 1 disease HB BP > 2 disease IT/PS UP simply because the HB glyph is so amazing.
It's true that at first when you're using the HB BP rotation it feels like you do not have enough time to dump all your RP (and this is definitely true if you get extra RP from AMS soaks or whatnot), but with practice and low latency you can expend it well enough. In UP you just have way too much dead time using HB glyph instead of IT, but of course there are exceptions to the rule.
My suggestion is to run a couple 10+ minute long tests as either glyph setup and see where your DPS is at. I originally was a huge fan of UP IT/PS, and still would prefer UP for the run speed and GCD if it outdid my HB BP, but sofar the latter has been working out better for me.