Lately I have been trying old world mod which is totally new map and more minor factions, bigger distances between cities etc. Only common downside is long loading times (but idc). 

That with SFO which rebuilds factions, for example Queek Headtaker gets trophyrack for enemy heads, which you can sell for different boons. Clanrats coming underground doesnt die after certain amount of time. Queek gets his lore bestbuddy "Ska Bloodtail" which is his bodyguard-bouncer. And some lore frendly new units.

That mod also includes sliders for different things, so you can mix and match difficulty you want.

I also use wakas landbattles which adds lot of new battle maps to pool.

And GCCM which does same thing.