In battle, when I used my rouncey... he's dead 20 seconds after because 3 arrows hurt him.It's very unbalanced and not fair for cavman because we can't charge enemy with light horse. So i suggest to add more hitpoints or armor for the horses like rouncey, steppe horse, desert horse, palfrey, courser and arabian horse.
Stop riding at enemy spawn trying to get the jump on the enemy team.
Stop trying to engage aware groups of archers.
Ride in when your infantry is about to engage and the enemy is not watching their flanks.
Those horses are meant for skirmishing.