Thanks Jaz!
Discussed some things with the person who did Seasons of Skyrim, one of my favorite ENB's, which I am hoping to get working with CoT darker dungeons and nights. In the meantime I did find a good combination that worked well (although a bigger FPS hit then RCRN), which is SkyRealism Cinematic ENB combined with CoT. Here are the results.
SkyRealism Cinematic ENB version 0.126 and Project Reality: Climates of Tamriel
Sunrise Orphans Tear
Daytime Orphans Tear
Sunrise Oakwood (modded town at lake below Bleakfall Barrows)
Day at Oakwood
Bright Day outside Windhelm
Grimwolf in Action at Tavern Dual Wielding
Last three at Moss Mother Cavern