It might also be a good idea to slow the hell down in your expansion, establish alliances and use protectorates as buffer states. Especially as the Romans, rapid expansion is downright dangerous and, eventually, mentally exhausting.

And remember, once you got allies and/or ceasefires and you happen to share a border, you'll have to pay tribute to keep the peace. Seeing as you're rich, 1k a turn or less wouldn't be a bad idea to keep the peace with those who share borders. EB is wondrous, but the RTW engine itself has limitations.