I've recently begun wondering if Deadly Poison is of any use to a Combat rogue over Instant Poison (or any other poisons for that matter). I tend to simply throw whatever I have more of onto my blades and I just felt I needed to ask.
I ran around for a while using the two poisons separately (one session with Deadly Poison on both of my weapons, the next session using Instant Poison) and on average I was looking at a good increase in DPS from Instant Poison compared to Deadly Poison.
DPS:
Instant | Deadly
423 | 396
I'm aware that Deadly Poison breaks things like gouge and blind making a mid-combat bandage difficult, which makes using it even less appealing. It would seem it's only real place is against other rogues (especially when they pop Vanish and/or Evasion) but I can't really see it being too useful otherwise. I'm also aware that the damage of mutilate is increased against poisoned targets.
I guess my real question is: are there any situations where using deadly poison would be favorable over instant poison?
Oh! And are there any rogues that can clarify if a DPS of 423 is good for a 67 rogue? I tend to top the meters in groups and I don't get to group with other rogues often enough to figure out where I should be.