I have tried everything from roleplaying, modding (mainly SFO) and running silly army compositions. Every time i start a new campaign i lose interest at arround turn 60-70 because game becomes too easy.
I play on very hard both campaign and battle difficulty, but as soon as i have taken over a region it usually becomes a snowballing game from there, with no army being able to win vs my semi doomstack.
I always wish the chaos invasion starts earlier, because only when outnumbered 2 or 3 to 1 there is a decent challenge.
Ofc i lose battles when they attack semi-undefended cities, but i miss a good challenge for my main army, which the ai avoids like the plague.
I don't want to play legendary because i dislike playing whack a mole/riot in my cities due to insane PO penalties.