It's obvious rejuv is your number one. I wouldn't be so quick to drop 4% healing on it.
Looking at the way you heal I would suggest 2 healing specs dependent on the fight. That's the only way you'll be able to keep mana up and see the numbers you want to see.
Magmaw you used no direct healing outside CC procs and probably ToL. I would suggest using a spec like:
http://wowtal.com/#k=gB3IMKRR.aei.druid.
If you get in an have no mana problems, take 2/2 furor and add it to gen. If you don't like emp touch to refresh LB, put it in Nat.
For the bosses you're progressing/soon to be progressing through that spec should be fine. If you are topping meters without nourish and not having downtime, don't force yourself to use it. There's no point. And if so, no point in putting points into it either. I don't see in 10s when in most of the fights, especially beginning BWD bosses like you did last night, you'll be blanket RJing 10 people, the point in dropping 4% healing.
Also, you are healing with a resto shaman and a holy priest. No point taking Nat cure. They heal when they cleanse and you wont be using it for awhile anyway.