My suggestion is to buff the charge damage and survivability of horses a lot, maybe (maybe !) decrease prices a tad, as a tradeoff to a big nerf in maneuvrability (expescially for maneuvrability-oriented horses).
There's a reason why cav charges were, well... you know... charges. Not randomly picking on scattered enemies.
My impressions as HA on cav....
Why do cav need a buff?
I still see good cav players doing good effort for their team.Especially the ones using sarranid horse or destrier.( high riding skill)
When i see rouncy, palfrey or even courser i automatically assume that they are noobs.
But many cav are so dumb idiotic that i guess they need mameluke horse + plate armor in compensation.
I'm HA and about 80% of the cav i face are pure idiotic=trying to hunt me in open field without archer support.
The only cav i take serious are the ones using sarranid horse + high riding skill, as they actually have a chance in killing me, when i'm not directly near big fights.
I don't know you, but as 100% of other HA's you sure are focusing only on enemy horses. Melee cavs have absolutely no means of defense against that (the game is sick broken about that, how can you aim an shoot while another horse is bumping into yours...), and the only defendable reaction is fleeing to "ally archers", if they exist and care to help you, and if your horse survives the escape run. Chasing the HA usually isn't idiotic. As he flees, just go back, hope he's victimizing someone else, and enjoy a few seconds of safe time.