I'm at a similar stage in my Romani campaign, except that I've got Massalia, and I don't have Mastia. however can still manage to upkeep 9 legions (here, 1 legion is a halfstack, consisting of 1 accensi, rorarii, hastati, principes and triarii, and 1 allied skirmisher, 2 allied infantry, 1 pedites/hoplites and 1 allied cavalry, with 1 or 2 generals) and 2 consular legions (which is twice a normal legion), and I'm getting a base of 15000 mnai income per turn.
I think the problem is that your troops cost more than the troops I use. perhaps, you could raise taxes, decrease the amount of buildings you build (I see you have spent around 10000 on construction) for a few turns, restructure your legions, temporarily halt the war, reduce garrisons, create new legions from your garrisons (if they're not all made of akontistai).
actually, public order should be easy to maintain, and an increased population leads to more taxes paid, although it doesn't appear to be, since an increasing population causes the city's income to appear as negative.

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