As far as I know, you won't be able to mod the AI to your liking. If I understood well, the only mod you've been playing with is WesMod. In case I'm not wrong, I suggest you give a try to mods like BKB's, it features many more factions so it's way harder to have a "rush" tactic at the beginning. The game is very challenging, especially in the East with many new factions (Kievians, Armenians Il-Kahnate...) and buildings.
In my opinion, WesMod is based on a very good concept (homeland) but in the end, once the AI factions lose their homelands, they only produce junk units.
If you want a "brand new" game you can only try HTW (Hellenic), it's really worth playing.
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