Lowered building upkeep by 70% was too high. Ai will attack in force with more than one army.

Peace will be easier to get.

Lowered recruitment and upkeep costs and building costs. Was too high.

Raised base income level to help poor Ai factions.

Ai will be less likely to retreat when invaded and less likely to send only one army to attack.

Lowered squalor penalties. Economy a bit harder.