Then you are doing it wrong.
As IF spec you have a lot of roots and other utlilities to peel and stop dps,
so your healer has a chance to recover.
Running in Full augmented WH combat tech with power generator and 1 BM power relic.
Having 53,60 white dmg reduction, 980 max dmg and when you lvl up a consular and jedi knight to at least 40
You get their buffs also wich increases dmg and gives you a flat 19% dmg reduction to internal and elemental dmg.
You can still dish out major dmg and stay alive, highest stockstrike i had was 5.2k
Did a stockstrike and suddenly saw annihalator medal, was so busy with fighting that i had to check stats after game ended to see the dmg done.
only good marauders can kill you.