Just to update, in case it's relevant to anyone or anyone has further ideas, I've reinstalled the game on vanilla settings, with fresh enb files, enblocal, and only enough mods to test (Alternate Start), and the effect still happens. I'm at a loss for what to make of this effect and seem to have run out of ideas for how to fix it. The effect, contrary to my first impression, affects all versions of ENB regardless of the ENB preset I use. .262, .279, .292, .305... Any further ideas?

Here's the effect on today's rebuild of the game: https://youtu.be/lrAZF1bXywc

http://www.modwat.ch/u/midquest
enblocal: http://pastebin.com/TKP59SMe

I've already said, it's skylighting enabled.

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I am INFP, not the brutal, godamnit.