Healing and Overhealing - Gardien Construire PvE - ESO

For farming in a party, turn off symbiosis and keep on this tab, you will not need that much of heals out off dungeons and trials.

For dungeons and trials, turn symbiosis on, mark the Boss with Siphon, change tabs, tether to anyone and Combo Reconstructive Domain and Illustrious Healling at the same place

use Runeguard to buff

AND EITHER

Keep using chakram to protect and stack crux (in a dundeon, it is your only way to stack)

If things go wrong, position yourself and Curative Surge at your party

OR 

just auto atak (always hold for heavy atak) your tank to keep him healed with Symbiosis

For sets

The helm and the shoulders you can use one of each this four, as wearing two pieces don't give you that much of a bonus as wearing one:

Symphony of Blades

The Troll King

Earthgore

Sentinel of Rkugamz

The second setup is just a test focus only in amping the %Healing Done