you should try one of vanilla default settings.
I am currently struggling with getting my game stable. Constantly crashes at 2,9 GB ram.
What do you mean with vanilla default settings? Vanilla ini:s? I have Installed Skyrim revisited (highest availabe resolution on textures, no more than 2k though)+immersive armors. I use all ini tweaks from Skyrim revisited guide except the z-fighting tweaks. I have ddsopted with 1k normals skyrim hd, searious hd, skyrim realistic overhaul, the official textures and all the mods that should be optimized according the STEP
ddsopt guide. Have an AMD 7950 3gb card, 8 gb ram, win 8. 1920x1080 resolution.
Yes you will get all of the FX as well if you enable them. They are all separate from the color correction codes (Or have their own in the case of Bloom).
... and reflection/light scattering no?
Also saying that the main difference is the shadows is a bit of an understatement. Then it is just because you have not activated any other features.
Brightness etc. are part of the color correction so they would obviously be the same as vanilla, since they are forced to have those values.
You obviously know more than me about ENB :-), the improved shadows is just the thing I noticed most, also the main reason for me too use ENB.