Having another production city nearby would clearly have increased our unit production by a significant percentage. It would have to have enough food, unlike HC, to get to pop10 or so.
Targeting the early wonders was clearly the right move and conflicted with earlier warring. Settling Bovino to get the ivory in the BFC would have saved some turns on Zeus and given us +1 happy without lessening the production capacity of Bovino, but at the expense of some coins.
Targeting a distant AI first, like Sal, is always dubious. We were trying to beat lbms, iirc, or slow his runaway train in any case. I think allowing only one AI to get Rifling was definitively a plus and even stone-aged Sal and some others weren't far off. I think that strategy was right. Perhaps ZPV's right that we just missed on Brennus and managed to undercut the rest just fine.
Another aspect of speeding up the game is that we were dependent to some degree on the AI tech rate. We didn't tech Cuirs, but they were essential to our conquest. So when we were able to steal Mil Trad was probably a limiting factor, perhaps the limiting factor. In fact, once we had a sense of where the game was going, the smartest way to strategize might have been to figure out how to get some AI to get Mil Trad soonest, if that was manipulatable at all.