Healing is basically like so:
1 = all cast downranked lesser healing wave on main
2 = ditto for 2nd guy in group
3 = same for 3rd guy
4 = same for 4th guy
5 = same for last guy
6 = same downranked lesser healing wave but [target=focustarget] so I can heal someone else
7 = [target=focustarget] healing wave (for big heals on my target)

I finished up Sunken Temple with that group no sweat until the last boss, who pretty much spanked me. Not terribly surprised as he always hits hard on squishies (and DW shammies are squishy, no doubt).