Low DPS Affliction Warlock need help/advices

[DemonCratic 0]

So, I'm a warlock ilvl 665 right now, and I'm worried about my DPS, I'm not sure if it's low or not for my ilvl but it seems low compared to the data I saw on Noxxic, so I'm an affliction warlock, I respect the exact same rotation that Noxxic and Icy-veins show, and I'm getting around 20k DPS on training dummies, buffed with Grimoire of sacrifice, stone from highmaul and an elixir of intellect. I don't think that's good dps for my ilvl.

My rotation is the following: I begin by using Soulburn : Soulswap so I apply my dots directly, then I cast Drain Soul as a filler, I refresh agony when it's = 7 seconds or a bit less, Corruption I refresh it when it's 5-6 seconds, Unstable corruption refresh at 4-5 seconds. I'm never gonna use a soulburn on a regular haunt unless a nightfall procs like directly after I apply my Soulburn : Haunt, I'll mainly save up my soul shards for Soulburn then haunt, so 2+ soul shards and it's mainly when I have the Soulburn: Haunt buff up that I pop Dark Soul: Misery (I'm not sure when to use it so I use it at that time)

 

So to go straight to the answers/advices I need

1. Is this good/normal/bad DPS for my ilvl as an Affliction Warlock (Buffs: HM stones, Draenic potion, Grimoire of Sacrifice)

2. Should I play Affliction at my ilvl or another spec such as Destro

3. Is there any problems with my talents? I don't think my gears really matters since I'm pretty low ilvl but am I missing something?

4. And maybe advices, etc... you know what I mean, thanks in advance

5. Is there something wrong with my rotation? If yes, could you tell me how to improve it please.

Bonus question: Is the legendary questline still worth doing, even if Legion comes out in 1 month and a half? 

 

Link to my armory : http://us.battle.net/wow/en/character/blackhand/Demoncratic/advanced

(I'm counting on replacing the pvp gears I have right now, since I'm mainly focusing on gearing right now) 

(And, it's my first Icy-veins forum so idk how to put logs, sorry.)

 

[fatwhacker 2]

I wish I'd seen this earlier, especially with the changes in 7.0 changing your spec. 

 

[lordarcon 1]

Grab your self a chipped Soul Prism - easy and it helps.

Talents look OK.

Contagion does more DPS then Absolute but is less consistent (and requires higher management)

Soul Harvest also does more DPS then Siphon Life (from a flat simcraft standpoint) - have to time it correctly with ring and CD's making it a pain in the ass.

Besides that - going to PM you some stuff.