Pretty easy at 45, i used Iresso, disable his aoe attacks, shield up, lift the sith, run back (away from the droids), focus dps on the droid Iresso is tanking and heal when he gets below 40%. Kill the droids before the lift ends and continue to tank/heal/dps with Iresso. Oh and interrupt/stun etc. If you don't got insta lift, just die once and you'll have all the time to cast it the second time.