Looks good! Looks like Rome will make you fight for your empire. 
I'm currently playing as the Lusitani in the HatG campaign, and have all of Iberia bar 3 regions, two owned by Rome that'll attack once I make sure Carthage can't attack me again, and the Turdetani who are my allies, basically my client but with the benefit of being independent. 
I'm currently expanding into Africa and the Balearic isles, my faction leader hasn't been defeated, is basically unmatched in hand to hand combat, and pretty much has stopped caring for prisoners and just kills them.
Like your campaign, Rome has expanded quickly, and when I discovered they were my neighbours already I was slightly scared they were coming for me next, but thankfully they wanted trade and seemed to like the fact I was fighting the same people as them. Instead I'm raiding Massalia and trying to get them to wage war on me so I don't need to fight Rome at the same time, and take land and split their forces up. 