As well as the above you can also:
1) Decrease the incomes of trade goods and slightly boost farm income.
2) Armour and weapon upgrades can also be removed. These give the player the advantage and imbalance the game as the AI is poor at building them in the right provinces.
3) Remove the valour bonus regions. The AI tends to push all of it's florins into trying to tech up to the valour bonus unit, even if it's not available for until the next era or so! It will cripple itself financially trying to do this, ignoring farming, mining and trading upgrades in the province.
4) Remove Grand Inquisitors and restrict Inquisitors to the Papacy and/or rebels. These agents are simply too powerful and if you really wanted to abuse them you could wipe out all of your rivals with ease. They also do a lot of damage as the AI uses them indiscriminately - even on it's own high ranking generals.
5) Remove Border forts and let the espionage begin. With border forts gone, AI spies will start to increase in numbers. They will survive longer and gain more experience, this will make them a bigger danger.
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