Did you try testing different part of your mod setup individually?
if I had unknown CTDs
and I'de suspect my textures being the issue,
then I would disable all mod unrelated to textures and move from there and test, test, test until it's stable.
If the textures are not stable (hitting 3gb, vram cap, etc) then there is no point in activating more mods
Once I get textures stable, I start activating section of mods.
For example "Unofficial Patches", "Other Fixes", "User Interface", etc.
Although you can assume these shouldn't cause problems.
Section of mods that I would keep an eye on would be:
- Automatic Variants Based Creature Mods
- Standalone Creature Mods
- The Symphony of Skyrim
- How The Game Is Played In Skyrim
- Anything SkyProc.
So basicly, start with textures mods only and if it's stable start adding "section of mods" in.
There's so many possibilities of problem in computer that it's hard to pin point.
If you get issues with only textures then it could be corrupt textures or software & hardware problem.
Modding Skyrim is more cruel then having an heartattack because you got hit by a Minty Lightning while fighting an horde of enemy.