Just curious, how much do you outlevel the heroic 4 quests? I was barely able to solo the first two rep Taris heroics 4, but only after I was like 5 levels ahead, with vanguard (even tank specced), with Dorne. On Nar Shaddas it hit the fan already, as vanguard has no CC and killing packs of 3-4 elites +1-2 strong mobs just seems impossible without dying or doing the "kill one, RUN AWAAAY to reset pack" tactics, it is slightly less frustrating with shadow (dps specced tho) as I have CC, but just as hard. Tatooine and higher planet heroic 4 I consider impossible as vanguard or shadow
Im now leveling smuggler as healer, so Im looking forward to what I can solo with geared tank companion, but I seriously doubt I will be able to outheal 3-4 elites beating on him