Improving shadow dps

[liquidfear]

So i feel like i have areas where i can improve on regarding shadow. I have the rotation down basically, i know what to cast/when, i know how to multidot, i know the basics lets keep it at that.
How can i improve my DPS in regards to stats/gear, and even rotation if im doing something wrong. Im thinking about taking the guild back to FL so i can get my 4 set t12. (will have 2 pieces that are heroic, but i imagine that i could obtain the heroic chest/hands through heroic beth/baleroc now that we have gear) or should i just get 4 set t13?

heres my opener/rotation: SW:P -> shadowfiend -> flay till 5x evang -> MB (till orb) if no orb keep flaying till 1 orb -> vamp -> DP -> archangel -> keep dots up -> blast when i have an orb, or if EP is above 8 seconds.

should i reapply my dots when my DMC card/power torrent or whatever else is nearing their duration so that i can extend it via dots, even if my dots have a reasonable amount of time left on them?

i have approximately 2600 haste, and im exactly at the 17% hit mark. I also always get dark intent, so should i reforge away from haste to mastery untill i that that 2150 haste mark or whatever it is just so i can get the extra Vamp tick? or apparently crit is becoming more valuable, so should i balance out crit/mastery while staying at 2150 haste?

here are the logs/armory for this week (i dps hagara, ultra, yorsahj, warmaster and madness)

h t t p : / / worldoflogs. com/reports/am8pd5zu7cps64dj/
http://us.battle.net/wow/en/characte...ghmad/advanced

Cheers, anything helps

[Johnism]

Haste>Mastery 95% of the time.
MB on CD, never fish for orbs.
VT>DP>SW:P>MB>Fiend>Flay.
Don't Dark Archangel right off the bat as most your procs will drop off by the time you get charged to do it, use DA second proc round. Unless Heroism/Bloodlust off the bat.
Refresh DoTs on DMC:V Proc and right before drop off.
ht t p : / /raidbots. com/epeenbot/us/darkspear/hughmad/ (remove the spaces), most fights you're average or just slightly above.