Thanks, guys
Yeah, maybe my stats are the case ... I can't get rid of Haste for now. Almost every PvP piece of gear has or Haste or Multistrike, two of the most hated stats for destro. Anyway i'm at 24k-25k dps right now. Still low. As Affliction with same gear i do around 27-28k dps. 33- 37k on Mage. Oh, and maybe numbers on my Mage are so much higher because Mage hits two training dummies with his most powerful CD spells:P But that is not the case with my Rogue.
This is Affliction 4 pvp set bonus, Destruction gets 50% increased Incinerate dmg on target affected by Immolate. I don't have 4 piece set yet, just because of two much haste and multistrike. Maybe i should go for it ... 50% stronger Incinerate should worth at least 2k additional dps to compensate with loosing some Mastery and crit ...