Meneth, when was the last time the various vassals focuses have been examined?
The reason why I ask is that, from a balance perspective, the current focuses seem to favor one slider over another too much.
I think that "normal" ones should be (by a very mild amount) most efficient across the board, even if for each value they have different values. So for example a "normal" focus for a feudal vassal would give less tax and more levy then compared to a city one. However, I think that the sliders should reflect more fully the "effective" value of the sliders. For example, if you ask for max levies from feudal vassals, those who provide most of your troops anyway, then you should only give a mild increase in troops in return for sharply reduced taxes. In contrast, for city vassals, asking them to focus on taxes should only provide a mild increase in taxes in return for sharply reduced levies. Right now, the focuses are no-brainers from their already given values. I think there should be more "cost" for focusing on something completely.
***To clarify, since feudal vassals give so_little_taxes anyway, having them sharply reduce taxes for increased levies is a no brainer. In contrast, since cities give so_little_levies anyway, sharply reduced levies isn't enough. So, perhaps, increased focused out of the normal should have a different "cost" for it to be meaningful. Perhaps a penalty to opinion?