[Update] Have tested out a new 51/0/20 spec for the latest patch. Click here for results. Previous build results have been left below for those who are curious.
Thought I'd post some recount data and some observations on a test I did on the PTR of a spec I was thinking about using when the patch hits.
Spec and glyphs used: 51/02/18
The Glyphs aren't ideal, I'd probably pick up the Deathcoil and DRW ones over DnD and Ghoul, but I haven't been able to get my hands on them yet. Also, I don't normally spec bloodworms as I haven't really found them helpful when raiding, but I thought I'd try them out in this test as I was curious how much DPS they would add. The points they replaced were originally in Improved Blood Presence and Vampiric Blood, and while they don't add anything to your DPS, they do help survivability. Anyway, was just curious, enough waffling, on with the results. ;D
This test was conducted on the Boss dummy in Ebon Hold for 20 minutes straight. My ghoul and I are only buffed with Horn of Winter and there are no debuffs on the boss apart from the ones I put up myself. The results are missing Necrosis damage due to the Dummy bug, but as it hasn't changed from live, it should probably be doing around 7% of my damage. DRW duration is shorter than it should be too but is apparently a known bug. The rotation is quite complicated and once it gets going is basically the same sequence repeated over and over (assuming no misses) with DRW and Hysteria thrown in when they are available and when your RP is full. I won't give the exact rotation as I don't approve of people just picking up rotations off the net and not really understanding them, but it's all about keeping both diseases up, using many Heart Strikes and Horn of Winter (yes, I incorporated this into my rotation) to build up near max RP (should be around 120-130 if you've performed the rotation correctly) for a Death Strike and using an Obliterate just as the diseases are about to trail off, followed by Death Coil spam and then starting the rotation again.
Total/Percentage damage done by the top 8 abilities
Death Strike
Obliterate
Heartstrike
Bloodworms
Rune Weapon
Ghoul
Pet damage compared to mine
In summary:
I'm quite happy with the results. It's putting out more DPS than I'm doing on live, even without the Kirin Tor ring and Greatnes card I got recently.
Ghoul is a nice DPS increase although it's survivability in raids may be a problem without Night of the Dead.
DRW duration is awesome, even with the bugged duration and the reduced damage. When the duration is fixed and with the Glyph that adds 10 seconds, it'll be even better.
Bloodworms are kinda meh. Assuming they are alive for their whole duration (not always goig to be possible), they do about 1.5% of my DPS, or 0.5% per talent point, and the healing is miniscule, so I'm not sold on them over survivability.
Deathstrike. There are people on both sides of the fence on this one, but as you can see by the results, the damage difference is very small and using DS while diseases are up and OB when they are about to end does alot of damage and gives enough death runes for HS spam each rotation, and seeing as HS is pretty close to (and can crit higher than) OB, that's a very good thing.
Hope this info is interesting or useful for people that can't get onto the PTR or don't have time to test a spec like this. Comments and discussion are more than welcome. Sorry for the wall of text (to be fair though, I did try and add alot of pretty pics too!) :P