lol, I tanked HM FE for my first hard mode flashpoint wearing moddable gear containing items from the daily group quests. Guess what, it was all tank gear, I had no survival issues, and we cleared it with hardly any problems even though we were all noobs, this was pre nerf by the way.
If you havent picked up the recruit gear from the pvp vendor I suggest you do, its probably better than what you have right now.
If you use dps gear you might hold threat a little more but your ability to survive boss encounters will plummet due to your lack of defense, shield rating, and absorption.
PS That was with a juggernaut in full immortal spec.