Ok bad day at work. Looked at your 2nd video and if you watch the casting of the toons when they are in the puddles it doesn't look like they get anything off.

Maybe try a different dps macro. The channeling might be messing up with the dot on you.

Here is a challenge to all the shaman teams (myself included) can anyone beat this on heroic with no healing streams and no nature resist totem? Shit might as well say don't use chain heal also.