For everyone wanting to use CoW, try another talent....just try it try WoM or saving grace for that matter. Just because some well known healer or top ranked priest uses CoW does not mean it is going to be best for your group.
I have some settings up on the settings manager already. Ignore the ilvl on them tweak them a little more to your preference and raid size. I have 0 mana issues with these and they have been my base settings since 615.
FOR EVERYONE
Being top on the meters or logs does not mean you are the best healer. Oracle will top meters, it will oom you and it will go completely beast mode if needed. All this is moot if your raid team is dieing, you are oom halfway through the fight and you are not healing properly and just overhealing like a lunatic.
Oracle was not thought of to be a ranking machine. Most fights people rank on are doing that fight the way they are TOO RANK. Other healers are unnderhealing to let one healer outperform.
All's well that Heals well,
Bennyquest