I ended up abandoning my modded Oblivion installation and started fresh but this time I followed the Bevilex guide on Nexus since it's a finished guide and still being maintained today. I've had a few quirks but nothing I couldn't get past so far. Hopefully, I don't come across a persistent CTD like you have. At one point, the game would crash if I tried to fast travel so I walked instead to a different location and was able to fast travel from there.