Some help with Getia.

[Ignopotens]

Fixed

Oh now I see the solution is quite simple. Conquer more of Greece :)

The Central European cities don't have nearly the earning potential of Greece, and once you take all of Greece, it's not even a front but a rear area for you. That would solve your economic troubles pretty easily. It might be in your interest to let a couple of your border towns rebel if you find you can't hold them while you move into Greece.