You shoulda built the mines in Carna first. They're twice as effective. Also, why Type III govts. in those Arabic cities? They make no sense tech wise (nor recruitment wise. You can get phalangites with a Type i government). Unless you're roleplaying, of course.

Bear in mind that one of Saba's chief weaknesses is law boni (in that they don't get any aside from garrisons and temples). This'll limit your effective income, especially as your empire grows larger. Distance to capital is a b****. Same for nomadic factions, of course. And Koinon Hellenon, astonishingly.