In Combat Healing - Medpacs, and you can spec into Unleash heal as well.
Offensive burst on a tank would be pretty stupid.
Extra Endurance + Armour? Juggernauts/Guardians are already the tankiest class, far more survivability than their other tank counterparts.
CC vs. normal mobs: (not sure the jedi skillnames) Force Choke, Ravage, Companion CC, Force Scream, Smash
Juggers have the best tank CDs ingame, and when their incombat procs are up, the highest defenses too. They have adequate CC vs. normal - silver mobs. What more could you want?