Can't change stack size of items individually

Tried putting item id's in "IndividualItemStackMultipliers": {}, in the config...didn't work.
Tried changing "VanillaStackSize": and "CustomStackSize": in the data file...didn't work.
Talking about water jugs setting to 1 even though "Food": 5, is in "CategoryStackMultipliers".
And keycards setting to 10 even though "Misc": 5, (which is not working with keycards btw cause they are not even stacked by 5
but by 1 only).

So, how can I change stack sizes of individual items?

Update: Could use stacksizecontroller.setstack waterjug 1 in console and change the stack size for water jugs.
But stacksizecontroller.setstack keycard_blue 10 didn't work even though the console says so.
Keycards still do stack with 1.