Hmm, interesting observation. I'd also noticed Carthage staying in Africa initially, but in a couple of longer campaigns after many years they have suddenly exploded and taken all of Iberia and half of Gaul. I'd supposed that they were biding their time and building up their economy until they got their reformed units, and then started kicking arse (pun intended).
As for Epiros/Makedonia/KH - I find that things are pretty evenly split as to who gets the upper hand in their neck of the woods. There's no clear dominator as far as I've seen. That suggests to me that the balance is pretty well spot on.
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