A 4*HS Rotation should deal more damage. The exact point is that the OB consumes the DRW diseases and reduces dps.
With the
[Sigil of Haunted Dreams] going from haste to Critical Strike rating
[Sigil of Awareness] becomes less valuable and a double OB rotation would be a dps nerf.
Going from a 51/13/7 to a 51/0/20 using a 4*HS rotation with Blood Glyph &
[Sigil of Haunted Dreams] will be a great dps increase. A permanent 3.768% Cc is rather nice.
With current numbers on PTR the HS damage using
[Betrayer of Humanity] and 5000 AP (Raid Situation):
Without Glyph of BS
((758) + (3.3 * 5000 / 14))*0.6)+220.8+(110.4*2) = 1603.54 Base damage 1747.86 with Bloody Vengeance.
With Glyph of BS
(((758) + (3.3 * 5000 / 14))*0.6)+220.8+(110.4*2))*1.2 =1924.24 Base damage 2097.43 with Bloody Vengeance.
With Glyph of BS and Bloody strikes
((((758) + (3.3 * 5000 / 14))*0.6)+220.8+(176.64*2))*1.2)*1.3 = 2708.19 Base damage 2951.93 with Bloody Vengeance.
With current numbers on PTR the OB damage using
[Betrayer of Humanity] and 5000 AP (Raid Situation):
Without Glyph & without [Sigil of Awareness]
((758) + (3.3 * 5000 / 14))*1)+292+(146*2) = 2520.57 Base damage 2747.42 with Bloody Vengeance.
Without Glyph & [Sigil of Awareness]
((758) + (3.3 * 5000 / 14))*1)+502+(261*2) = 2940.57 Base damage 3205.22 with Bloody Vengeance.
With Glyph & [Sigil of Awareness]
(((758) + (3.3 * 5000 / 14))*1)+502+(261*2))*1.2 = 3528.68 Base damage 3846.26 with Bloody Vengeance.
Overall Damage Breakdown:
4*HS is 2951.93*4 = 11807.73 Damage.
2*OB is 3846.26*2 = 7692.52 Damage.
So overall 4*HS is a gain. Swaping to 51/0/20 is also a dps gain. And the diseases from DRW are also a gain.
Blood Glyph is Goooood!
Edit: Forgot to factor in Bloody Strikes

done now.