We've just managed to clear EN on Normal (we're a casual raiding guild) and whilst we downed every boss, I feel as though my healing is really low and I'm struggling with Mana management.
Logs: http://www.worldoflogs.com/reports/rt-ajub5x3d6lvs3gaw/
Armory: http://eu.battle.net/wow/en/character/draenor/Zhorael/simple
My overhealing is really high which gets pointed out on most bosses and whilst I try and watch what I'm doing I just can't seem to reduce it. I think I manage to last at least 2/3's of a boss fight before I start struggling with Mana and my heals start slacking.