I'm happy to know you succeeded in defeating the Romans, but that means I will have to take revenge upon Carhago in my own campaign.

Anyway, I've never tried Very Hard/Very Hard, but I know that at least for the economic part the VH diff should be actually beneficial for the player, as well as the AI, which Hard does not do. I'm currently playing Hard campaign/Medium battles, as I do not like the concept of any kind of bonus to either side. I play historically and don't spam armies, so Medium brings me the challenge I expect.
Just to add : as Rome, I haven't made such raids, excluding the ones against Carhage and Thapsus, I executed them in an year with a single legion, I relocated the cities, destroyed every building I could (shame you can't burn their fields and raze their walls!) and then left Africa. It was a big blow for Carthage, which didn't take back the settlements for at least 4 turns! Left ungarissoned and on VH tax rate, with no buildings, the cities were still Roman for so long!