If your capital still is in Bibracte, how the hell do you keep the easternmost settlements from probing civil war all the time? If I stretch my empire quickly that far away from the capital it's hard to keep those guys quiet at all, at least without garrisoning every town with a full stack after selling all inhabitants into slavery... I usually am forced to expand very slowly as I really have to secure and appease city after city, but you somehow seemd to blitz the whole world, achieving that in 190BC...