15/31/5 here.
I have been told, and also theorycrafted myself that Combat Daggers is the best spec for PVE dps....
Even though I'm usually finishing in the top 10 on total damage for bosses and trash (according to realmstats), there are 3 or 4 rogues that still usually finish ahead of me (Combat sword rogues)
My MH is Gutgore Ripper (only because Perdi or Dragonfang hasn't dropped yet lol), OH Core Hound Tooth....
Maybe my rotation is jacked up, usually it goes something like this;
Ambush > BS > SnD > BS > BS > BS > (eviscerate if mob isn't dead by then) Then just replace Ambush with Backstab on pulls with multiple kill targets. I use adrenaline rush almost every time it's up, and blade flurry in close proximity multi-add fights.
If I'm doing something wrong, or you have any tips or recommendations, I'm all ears.
Thank you!