Hi. I have a project that may help you and it's open source on github.
https://github.com/danwilkins
The first part is a zone extractor that extracts zones (with correct collision), objects (with correct collision models), and support for transparency, the transparency from black shader, animated textures, vertex animated models, and the general correct lighting model for EQ (looks like you're using the standard Unity shader).
I think it's quite a bit further along in terms of accuracy compared to whatever you're currently using and in one click, it can import the zone, lights, objects and sounds and assign the correct shaders.
Let me know if you'd like some further assistance. More info about the project is here:
https://www.reddit.com/r/everquest/c...ntern_project/