Been playing 1212 AD for a while now

The main problem I keep encountering is damn aggression. My first playthrough (Hard Difficulty) as Castille was great, within a hundred turns I have conquered all of Iberia and some holdings in France and Algeria while being at war with most powerful factions (England and HRE including their vassals). It was all great but it was becoming annoying because they were just throwing 5-10 full stacks at me every turn. I had to find ways to peace out, the only thing I thought of was paying them a lot of money. I emptied all of my treasury to peace out with every Catholic nation. Then within 2 turns everyone is declaring war on me again. That was basically it for me.

2nd Playthrough

I tried to do France (hard difficulty). Within 12 turns I was nearly complete in conquering all of mainland France, but again everyone was just declaring war on me for no apparent reason.

3rd Playthrough

Went again as France but on normal difficulty. Within 3 turns every neighbor has already declared war on me!

Can someone please explain? I love this mod for its features but I just cannot stand the damn aggression. Help please.