I find Mantra of Evasion with the Hard Target rune tends to increase toughness significantly more than Healing with Time of Need, but I suppose you do lose the life regen, and you can't dodge everything...
Just something to think about.
The active on Mantra of Healing is great (if you spam it), but I noticed you aren't using the Chant of Resonance passive, so I assume that's not why you're using it.
Would also highly recommend the Resolve passive.
EDIT: Also, Crippling Wave with the Concussion rune should be your go-to spirit generator for a supportive build.
EDIT 2: As a further... for Torment 6, One with Everything is going to be almost mandatory. It's an amazing passive, as it lets you move your resists from a primary stat slot on items (all resistance) into the secondary slot, freeing up a primary for something else. It also allows more resistance per piece of gear.
Just something to think about.
The active on Mantra of Healing is great (if you spam it), but I noticed you aren't using the Chant of Resonance passive, so I assume that's not why you're using it.
Would also highly recommend the Resolve passive.
EDIT: Also, Crippling Wave with the Concussion rune should be your go-to spirit generator for a supportive build.
EDIT 2: As a further... for Torment 6, One with Everything is going to be almost mandatory. It's an amazing passive, as it lets you move your resists from a primary stat slot on items (all resistance) into the secondary slot, freeing up a primary for something else. It also allows more resistance per piece of gear.