As a count I am supposed to get *2 bonus, stewardship bonus +2, and gravelkind +1 for the total size of 5 demesne. However, I am allowed to hold 6 for some reason.
Does that mean that demesne size for a count who is using a gravelkind SL and whose stewardship is 0 is 4?
I am reporting this because I think this is a mistake. I thought CK+ allows characters to have less directly controlled counties, not more than vanilla. 4 for any counts with gravelkind is kinda too high in comparison to vanilla where it would be 3 although it has higher stewardship bonus.
I've checked define.lua and DEMESNE_MAX_SIZE_COUNT_MULT = 2 seem to be added to the base value rather than being multiplied as the name indicated. Is this WAD(in sense of the size of demense you want a count to have in the mod?)
I'm pretty sure it's because the multi_count bonus is being added to your stewardship bonus and then multiplied by the Gavelkind bonus (which seems to round up).
Base = 1
Multi-Count Tier = Base * 2
Stewardship bonus = +2
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Total before Gavelkind multiplier = 4
Gavelkind multiplier = +30% (1.3)
Total after Gavelkind = 1.3 * 4 = 5.2
It apparently rounds up from 5.2 to 6. If your stewardship was not providing +2 then you'd be able to hold:
2 * 1.3 = 2.6 = Rounded up to 3 counties
I think that's how the game is working, and the way the rounding is done from Gavelkind is hard-coded. In order to fix this edge case you'd have to reduce the Gavelkind % multiplier below 25% so it wouldn't round the total up to 6. Probably not worth it though.