How about manouver nerf,and speed buff? Give horses more health,and charge mode triggered by pressing x button.
Charge should last like 10 seconds,and any bump would deal heavy dmg. I like the idea by limiting movemen when you are in charge mode.
Couching get removed from light lance,lance and heavy lance,and only great lance should be couchable.
Add points in charge when cav rides in formations,like shields have when they form shield wall.
This would be a full win.
Maybie spear wall should be implemented too. Lets have some real medival battles.
