For anyone interested in the exact numbers, modifiers, and criteria used, I will post them here
Updated 3/16/25

Development Growth:
- Provinces will only be developed if they are fully colonized, controlled, and cored by their owner
- Development threshold is the base dev cost (the price if there were no modifiers)
- Default value is once every 30 years

modifier = { factor = 0.25 NOT = { is_state = yes } }
modifier = { factor = 0.5 owner = { is_at_war = yes } }
modifier = { factor = 1.5 owner = { ai = yes is_subject = no } }
modifier = { factor = 2 province_has_center_of_trade_of_level = 2 }
modifier = { factor = 2 province_has_center_of_trade_of_level = 3 }
modifier = { factor = 2 NOT = { check_variable = { which = netDevCost value = 0.8 } } }
modifier = { factor = 2 NOT = { check_variable = { which = netDevCost value = 0.6 } } }
modifier = { factor = 2 NOT = { check_variable = { which = netDevCost value = 0.4 } } }
modifier = { factor = 2 NOT = { check_variable = { which = netDevCost value = 0.2 } } }
modifier = { factor = 2 NOT = { check_variable = { which = netDevCost value = 0.0 } } }
modifier = { factor = 1.5 owner = { stability = 3 } }
modifier = { factor = 1.5 owner = { stability = 2 } }
modifier = { factor = 0.67 owner = { NOT = { stability = 1 } } }
modifier = { factor = 0.67 owner = { NOT = { stability = 0 } } }
modifier = { factor = 0.67 owner = { NOT = { stability = -1 } } }
modifier = { factor = 0.67 owner = { NOT = { stability = -2 } } }
modifier = { factor = 0.5 owner = { governing_capacity_percentage = 0.5 } }
modifier = { factor = 0.5 owner = { governing_capacity_percentage = 1.0 } }
modifier = { factor = 0.5 owner = { governing_capacity_percentage = 1.5 } }
modifier = { factor = 0.5 owner = { governing_capacity_percentage = 2.0 } }

Development Loss:
- Provinces will lose development montly when devastated (>=4 devastation)
- Each month each province has a % chance to lose development equal to half of the province's devastation. (50% chance at 100 devastation, 10% at 20, etc.)
- After a development loss, the province's area will lose 2 prosperity and the province will lose 4 devastation if it is controlled by its owner or 2 if it is not

Culture Spread Speed:
- Cultures will only spread to provinces if they are fully colonized, controlled, and cored by their owner, have no separatism, and were not recently culture converted
- Default value is once every 1000 years
- Provinces having a neighboring accepted culture multiplies the speed by 4
modifier = { factor = 0.5 NOT = { tolerance_to_this = 3 } }
modifier = { factor = 0.5 NOT = { tolerance_to_this = 0 } }
modifier = { factor = 0.25 OR = { is_state = no is_owned_by_trade_company = yes } }
modifier = { factor = 2 NOT = { check_variable = { which = netCultureCost value = 0.75 } } }
modifier = { factor = 2 NOT = { check_variable = { which = netCultureCost value = 0.50 } } }
modifier = { factor = 2 NOT = { check_variable = { which = netCultureCost value = 0.25 } } }
modifier = { factor = 2 NOT = { check_variable = { which = netCultureCost value = 0.00 } } }
modifier = { factor = 0.5 check_variable = { which = netCultureCost value = 1.25 } }
modifier = { factor = 0.5 check_variable = { which = netCultureCost value = 1.50 } }
modifier = { factor = 0.5 check_variable = { which = netCultureCost value = 1.75 } }
modifier = { factor = 0.5 check_variable = { which = netCultureCost value = 2.00 } }

Non-colonial subjects get a +10% dev cost malus
Colonial subjects get a +50% dev cost malus
Being at peace will increase devastation reduction and give a supply limit bonus