Just wanted to say this mod should get more exposure, all this time playing SS/BC/Retrofit with GUAM I never thought to try this out. It's excellent whilst keeping the flavour of vanilla (flavour of vanilla - haha) err anyway good mod.
XAI
I've tested XAI for other mods this seems to come with a whole bunch of other files. I am reluctant to install the test as it will overwrite files I have modded to my personal taste.
Modded to Personal Taste
An idea from Broken Crescent - I give the AI generals extra hitpoints, command, build points, troop morale bonus, decreased squalor, increased local popularity.
So AI settlements grow a bit quicker with a govenor and have less plague. Ai generals don't die to easily, AI armies suffer less attrition from battles it wins (battle surgery) so they have more veteran troops as a result (over time). Yeah it's great. Here's the trigger.
Also I only field a small number of armies usually one per castle upto a maximum of 5 (I roleplay basically) but it's hard to roleplay with an army with such high propertion of casualties every battle so I do 2 things. I improve the battle surgery for the Doctor ancillary to 70.
And give Doctors to all worthy generals (AI or human) with "worthy" being determined by having 4 or more command stars.
So yes every AI general will have a doctor and it means their armies have better survivability in the field and it also means YOU and the AI are fielding fewer green troops and more veterans due to increased survivability (assuming you win.. if you lose the battle your casualties are high - which is a great balance).
This could conceivably be combined with higher recruitment cost so that you develop what you have rather than you and the AI pumping out more inexperienced troops constantly - which is boring. Big balancing issue there though.
I've removed Crusade desertion as it's not something I exploit and I think it might help the AI to not lose so many men and be ineffectual on crusade (meaning I always arrive first which is boring).
Also lowered the Jihad piety required as I enjoy the extra drama of more Jihad being called. Just my preference as I generally play catholic factions. I don;t exploit I just try to help the AI give a better campaign.
I made changes that improve missile cavalry in terms of keeping them out of melee more effectively but I can't be bothered to apply it to all missile cavalry in the EDU.