Your number of battles is strangely low yes, what difficulty do you play on?

on VH/M the AI gets scripted money, lots and lots of them, so mopping up makes little difference; I always do it, even micromanaging the pursuit of every enemy unit, and I believe most others do as well from the screens I have seen. Next turn the AI will have hired a new stack of Mercs and produced lots of either Leets or cheap levy (no balanced armies for the Artificial Idiot). So it has little to do with that. I suspect you have either overrun your enemies fast and that they thus had little time to fight you.
I play slow-ish and I believe I usually would have fought about 300+ battles at 200 BC.

And welcome to the Forum.