My guild has been progressing on Heroic Hagara, this being the second week. We've seen a clean ice phase and our dps is holding up just fine.
The issue is lightning phase, we're forced into 3 healing it even though our paladin and shaman are pulling 20k hps each easily. Even with the third healer we're still ahead up the enrage timer as far as dps goes so I don't think that'll be the issue. I'm just reaching out for suggestions for 10 man and how to deal with lightning phase. It just seems we tend to die too quickly, and this is with a resto druid popping tree form tranq.
I made this rough diagram of what we try to do.
The numbers represent individual players and they're positions.