Thats why I love my Sith Sorcerer (I love the IA story, but the Sith Sorcerer is way more fun to play). I still have some healing abilities even though I am lightning spec. I haven't played bounty hunter so I don't know if they have some base healing skills without speccing into the tree, but you are correct, to use a tank companion correctly, you need heals. I use Khem Val (at least until I get the Xalek... I am on Voss now) and with proper timing of healing and shielding, I am able to do a lot of heroic2 missions solo.