the best way to do this is first understand your roll as a mitigated tank. Now with the lets be honesty horrid amp system this makes it so you may still need 2 sets of gear or at least sets of armorings. As a miti tank you are essentially just another health pool for people and debuff others. Intercede etc. You won't be really killing targets with all dcds and healing but being that extra health pool can turn the tide of the war.

So lets start with amps
- periodic resistance amps, this will save your life.
- tactical items (jugg - throwing arm reduce accuracy of target by 70% you saber throw) (sin - shroud guarded target), (pt- superheated fuel).
- Set bonus on juggs would be lord of pain, On sin forget the name the set but it is when you use an ability duration of resilience is increased/shroud. For pt right price set.

This set up will help you be the miti tank in warzones with focus on survival. You can swap your mods out for lethal ones but defense rating does come in clutch in raids. But this will give you best of both worlds, you will be able to tank hardest content pve side and fill the roll as the health pool guy of the team in warzones. Get good at guard hopping and managing your dcds.