Well, i'm experimenting with the building times to help the AI to tech up a bit, and i'm leaning towards a small speed boost for non farming upgrades.

What i still haven't managed to ackieve is to improve the AI economic management...
Despite all my attempts instead of investing money into creating an infrastructure the AI tends to squander almost every florin in units, and crappy ones more often than not, only to go into deep red once they cannot sustain the army anymore...

That said, there are some improvements so far, thanks to the improved roster focus you actually see the AI trying to build good units when it gets the chance, one of the happiest moments of modding development i ever had was when i happened to fight against gothic units in late... There weren't many but still it's much better than fighting vanilla spears in 1350...