I am echoing what others are saying about letting DPS just handle strongs/weaks HMs. If I have two elites, Whirling Blow, Slow Time, Breach and alternate Projects and I have no problem holding aggro and that is with two comparably geared Troopers as DPS. More than two elites, CC. Do I loose aggro sometimes? Sure I do, at which time I taunt and everything is fine.
I also use two purple DPS relics, the Power one from Taral V and a crit/surge one (not sure where I got it) which I use whenever they are off cooldown along with Force Potency. So unless I really **** up or am not paying attention I never loose aggro on single target fights.
The only real complaint I have is DPS that refuse to kill the strong/weak targets before moving on to elites. We have a guild Sentinel that refuses to do this no matter how many times he is told. Now that annoys the **** out of me something fierce