This is just a shot in the dark but on the b25 SF Grass Full v2 is that the one where the images in the mod are 2048x2048?
I ask because I was using that as well, and used to get CTDs after I'd already loaded the game and was out on patrol... always happened in the same general spot regardless of time compression. Everything else seemed fine.
After disabling all mods and adding them back one by one it turned out to be that particular mod, when I switched to the other version with files of 1024x1024 instead the CTDs stopped and I was able to add all my other mods back in with no problems.
Granted I know very little about most of the other mods you have listed so it could be something else entirely.
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