- Balancing Classes: In NW, heavy cavalry is too maneuverable and has not got enough health (as the armour would suggest). In contrast, light cavalry is perhaps too tanky and not as maneuverable. Balancing needs to happen to make them both more accurate so hussars are actually light and heavies are actually heavy.
Heavy horses are too maneuverable in NW? You can turn Greyhounds faster than a heavy horse. I'm pretty sure it was NW heavy horses that lost the race against Tom Thumb
I don't think turning heavy cav into immobile turrets will help either historical accuracy or gameplay. As they are balanced in NW, heavy cav relies entirely on either having sufficient numbers to overwhelm enemies or having enemies make bad mistakes. The single most important asset for cav is maneuverability, whether fighting other cav or fighting infantry.
I would say I think hussars should be able to outmaneuver heavy cav, but not to the extant that they can runs laps around heavy cav as in NW. Heavy cav should be harder to kill in one hit, but it shouldn't be impossible. I'd like to see hussars less ridiculous in 1v1s against other kinds of cav, but be able to move across the battlefields more quickly, scouting and mopping up unsupported landwalkers (especially landwalkers without pointed sticks).
I'd have to see lance mechanics before commenting on how they should balance. NW lancing is hard to do, but a great lancer is almost unbeatable. Heavy cav doesn't have a prayer. Most of the problem is that the lance cannot be blocked. Even normal stabs will hit the horse if aimed properly, and no amount of downblocking stops it. A good start to balanced lancers is making sure that they can be in countered in some way more reliably than waiting for them to buck while another cav has the perfect angle to get him.