I agree with you, this map is the one that has the most potential for cavalry, whether for attack or defense.Where i find it to be most the case is around the last flag. When the defenders spawn they have to get down the wooden wall, and then there is this huge plain where there is cavs everywhere, + cav can literally JUMP over the wall to the last flag or climb it backward super fast. There needs to be tons of obstacles around there.
Every single inches of the inside of a Castle should be impossible to play as cav, its that simple honestly
In my opinion preventing a rider from climbing stairs would help a lot, all maps include.