My guild is currently 5/7 normal, going to finish and start Heroic on Fri/Sat. I'm in much the same boat as everyone with mana, but mostly my issue was understanding the way the puzzle pieces of atonement, raid damage, dps, and timers fit together.
I did come across a video by Youtuber Flintoid describing his disc experience and how he was able to reach top 10 in the disc charts, and even overall in one case. He shows his talent choices, what method he used to heal, and also has videos of most of his fights (normal and heroic). I'm going to try assuming his sort of style this Friday and see how it goes for me.
https://www.youtube.com/channel/UCpD...jB7E-TU3rUYMsg
Here's the link to his channel for anyone interested.