Some suggestions about heavy cavalry is that they are too cheap for how expensive they are. You can easily destroy 10,000 soldier armies with just 6 heavy cavalry in your army. They are essentially equal to 6 units. This makes them too cheap and plentiful for how potent they are. There should be a harder limit for how much noble units you can recruit because it makes no sense to recruit any other cavalry besides them. They far surpass light cavalry, horse archers and infantry. For example, a light/medium cavalry costs about 260 denars while a heavy cavalry costs only 360 denars. To balance this, there should either be a soft cap, or a steep upkeep increase to at least 860 denar per unit. This would give reason to have a diverse army roster instead of just cheesing the game with mostly heavy cavalry.