In all honesty, I thought I was a moron for not "getting" why so many people are in love with 0/10/61. In my tests it performed Ok-ish but certainly not amazingly better than other builds. Figured I just sucked at something or didn't know the trick with the build. Ended up with better results using a different Unholy build or deep Blood variations. But, again, that could easily be that I'm just too dumb to know how to make the build work better. It's still a bit early to know for sure if it's going to be "the build" for 3.1. Give it a few more days and lets see how the parses work out.
Ghoul Frenzy is really there for the healing. The haste effect isn't a vital DPS addition. But keeping your dead friend around a bit longer is always good. Oh, also be sure that you're
glyphed for the ghoul and that you
feed him!
Also consider starting with IT/PS when moving into position. I find that there's often a GCD to be gained from using IT while running at the boss. PS/IT gives just a bit more damage when in position usually though, just to be clear.
As a side note: Your DPS will make more sense put into context. Doing 1k DPS in regular HoL is one thing, doing 1k in Ulduar25 is another. When you're putting numbers in your posts try to include the context. That should help us all get a more clear picture of what's up.
Cheers!