Nargott
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Here's how the first scheme worked, using militia as an example:
Increase = 10.
Building a basic dwelling: income = 5.
Then, if you build up to a castle, the weekly increase is raised from 10 to 25 (10+5+5+5).
If you add an upgrade, the income increases by another 5 (without a fortress) or 20 with a castle (5+5+5+5).
In other words, you had to calculate the one-time income and the weekly increase separately, and also keep in mind which types of fortifications affected which tiers.
Increase = 10.
Building a basic dwelling: income = 5.
Then, if you build up to a castle, the weekly increase is raised from 10 to 25 (10+5+5+5).
If you add an upgrade, the income increases by another 5 (without a fortress) or 20 with a castle (5+5+5+5).
In other words, you had to calculate the one-time income and the weekly increase separately, and also keep in mind which types of fortifications affected which tiers.