Shaman root rotting spots

[jarlerop]

So I got my epic a couple days ago, yay! Been slowtanking while JBBing my way up until this point, so root rotting is rather new to me.

Last night I tried root rotting 4 at a time, using only epic for damage, but had a hard time finding good spots for it. Tried CoM second floor, but root times were inconsistent at best. I'm level 53, so I guess it will be better in a couple of levels. So far Kelethin guards seems like good pp, but around 30% are green now.

Any suggestions for good spots for this at 53+?

Bonus question: Rotting singles using epic + poison or disease dot, is that very inefficient compared to rotting four at a time using only epic for damage?