Here you go:
http://www.filedropper.com/experimentalcai
It is a very small submod, that basically just changes 1 value (the AI readyness to attack relevant to "chance of success").
However, I did test it for a while, and it seems it DOES make the AI more aggresive.
From what I saw, the AI is more likely to attack my troops, and there are less situations where there is a "standstill".
Of course, this is all relative, because there are many factors involved, but it does seem to work, at least somewhat.
To use it:
Drop it in your /data folder, then activate it through the mod manager. I`m not sure how the Steam mod manager works, as I`m not using Steam, but you should be able to figure it out.