Just to be certain - do mean to say that the zone highlight also works now?
If so, I guess the problem was somewhere in the logic you used before. Interesting.
This is a bit of a problem, and recent discussion illustrate that.
Personally, I like to keep the set-up data outside of the module - for example in a spreadsheet or JSON, and then I use the Python script vsavsave.py (using my Python module pywargame) to write the .vsav file. In that way, the .vsav files are always in sync with the module (.vmod). Now, vsavsave.py is not omnipotent, but it can do a fair bit. See also this post.
Yours,
Christian