Healing stream seems to stack. I see it in the floating combat text all the time.

One thing that helped me was having a seperate button setup for grounding totems. So after casters shoot 4 things at you it is easy to refresh them.

For PVE I would think you want Stoneclaw totems over Tremor totems most of the time. Stoneclaw will stun the mobs so they are beating on you. Also the way that tremor totem works is it sends out pluses that break fear effects. SO you want to stagger laying your tremor totems. So you have multiple pluses going out at multiple times (vs laying them all at once and having 1 pluse go out at the same time)



Toon1: castsequence reset=6 Wrath of Air Totem, Mana Spring Totem, Totem of Wrath, Stoneskin Totem
Toon2: castsequence reset=6 Tremor Totem,Grounding Totem, Healing Stream Totem, Searing Totem
Toon3: castsequence reset=6 Windfury Totem,Tremor Totem, Healing Stream Totem, Searing Totem
Toon4: castsequence reset=6 Grounding Totem, Healing Stream Totem, Tremor Totem,Searing Totem
Toon5: castsequence reset=6 Grounding Totem, Healing Stream Totem, Searing Totem, Tremor Totem