If you need tricobalt torpedos to kill you should increase your skills in tricobalt and torpedos, because 17k dmg sounds pretty low.
i'm using actual numbers that I get. I am fully specced for torpedoes and tricobalts, and then i have a tricobalt console.
I'm assuming that players are using brace for impact, because I have gotten 40-50k crits on unsuspecting targets (including shield damage and the kinetic reduction). Also, when I use my torps on targets who are recieving focused fire, they almost always have a multitude of resistances up, which I am assuming reduces my damage.