Bump.
Time for cav change.
I disagree
It's time for an infantry change.
Cavalry is heavily UNDERPOWERED on the paper. The horses are expensive, fragile and there are many mechanics in disadvantage for cav, like the limited attack angles or the increased horse leg damage.
Yet, in reality, cav is massively OVERPOWERED as class. And the explanation is very simple: cav is UP, because if its fought properly it would have no chance to win. The problem is, it's not fought properly, because it's not being fought at all.
90% of all players on the servers act like there was no enemy cavalry. But in fact your first priority target after spawning should be: fight enemy cav! Instead of autowalking towards the enemy, watch out for cav. Instead of shooting into the enemy infantry blob, shoot the horses at the flanks. Instead of running off with your shield and one handed weapon to have fun fighting three enemies at once, stick to teammates with spears. Instead of follwing the first two handed Kuyak wearer to support him with your pike, move along the flanks and the back of your team to form a protection screen against cav with the other pikemen.
Now that we can't expect the common public server lemmings to suddenly grow more clever, you have to do something about it game wise, offering feature which encourage the desired behaviour. As I already proposed, change the mod description, make some good tutorial videos, implement a working commander system, perhaps even change the battle mode to something similar like a conquest mode, so that killing is not the ultimative goal, to cut this suicidal "Enemies! Go a straight line to kill them as fast as possible... all 15 at once!"-behaviour.
Do this, and you won't need to nerf cav any more, if anything you can buff it by buffing armoured horses again and/or lowering upkeep.