[Imp]

Be careful revisiting riders since the patch they should only be used to reach the frontline or in a must need situation.
Watch the effects if hit them now especially with a MMG its worth hosing down to see if it has a rider, certainly if grouped together so splash damage hits several.

A tall map does tend to spread the AI if it does not have the forces to cover allowing the human player to easily gain local force superiority & pick off.
Now I think about it in a campaign if you adjust the map size for battle types it will make for a better battle.

AI defending > shrink height so a more dense frontage with less ways to exploit.

AI attacking > shrink width so has to travel less & so maintains unit cohesion better.
Stop fast stuff racing ahead to much.