I'd suggest attacking now as well, with the Axes being quite well promoted already taking Carthage shouldn't be too much of a problem, and the other cities will be much easier. I wouldn't mind keeping Carthage as well as Utica and razing the rest, its got a lot of food, 4 hills and a lot of grassland, so should make an alright commerce city. With all those forests it should be possible to chop out 1 or 2 workers quickly and begin cottaging everything in sight.
As for Alphabet, with the slower AI tech speed in BtS we might end up not being able to get anything except Polytheism and Archery or something like that, although I downloaded the save and had a play with the worked tiles and got a good increase in the amount of beakers produced, so it might be worth switching to, but not until we've got enough units that losing a lot of production won't be too harmful.
As for Alphabet, with the slower AI tech speed in BtS we might end up not being able to get anything except Polytheism and Archery or something like that, although I downloaded the save and had a play with the worked tiles and got a good increase in the amount of beakers produced, so it might be worth switching to, but not until we've got enough units that losing a lot of production won't be too harmful.