Well, first thing i see is you have no head enchant. Get Revered with CE as soon as you can, if you arent already. They have the Glyph of Ferocity.
Also, put +6 stats on your chest piece.
Other than that, what is your strategy while raiding? I pop trinkets, blade flurry while there are 2 tank targets, Adrenaline rush as soon as i can, always using them up. Get your attack rotation down, I SS until 3 CP's then SnD, after which I do a 5 pt Rupture or Evis. That should be a constant cycle for you in raids, although it may differ a little for swords (im mace spec).
Other than that, Ive noticed that little things like getting to your next target quickly and having a /startattack macro help out a lot. Always be planning your next move.
Obviously, you do more damage alive than dead. If the problem is that you die a lot while other rogues are living and dps'ing, then maybe the problem is you are doing too much dps and need to back off a little. Remember vanish is not just a pvp tool, use it to reset aggro in a boss fight so you can go buck wild on the boss right afterwards.