Alright, so I finally narrowed it down to one mod that gives me ctds when I disable almost all other mod esps/etc. And it is...Expanded Towns and Cities. Now, will it be easier to just straight up get rid of this mod, or does anyone have any idea why it may be causing me problems?
Edit: specifically, the exact esp where it begins to crash at when enabled is ETAC - Complete EWDR Patch.esp. This is one of the patch esps that refers to Winterhold - Expanded Ruins.
Edit 2: It appears my ETaC patches are out of date. I'm going to try uninstalling my current, then installing the new one, and see if that fixes it! *fingers crossed*