Can someone explain to me how with the Dukes being almost double the influence of all other factions, we haven't triggered a civil war with any other faction is the system?
Clearly a bug. Michael Brookes mentioned there was "an issue" when Dukes went to Civil War with nobody, then immediately went to Cool Down. Personally, I think we should own Gabriel Station, or at least get a Civil War over it.
At this point, we've seen you can start a Civil War by matching Influence levels*. We don't know if that will work with Dukes, as an expanded faction (which seems to have some bugs). If this hold true, we may be able to trigger a Civil War by lowering Dukes Influence to match either Law Party of Dynamic Commodities. We can do this by raising their Influence by trade or doing missions.
One problem is, we don't know if we'll be fighting over a station or not. We've been told Civil Wars are over stations, but logically, the gaining faction would attack the loosing faction's station. Dukes would be the faction losing Influence, but have no station to loose.
The other problem is, we want DC's stations since they're the controlling faction. But in order to get their stations, we'll have to match Influence with DC. At this point, Law Party has the higher Influence levels, so at some point, we'll have to match Law Party, going to Civil War with them, or Law Party will lower to match DC, making them go to Civil War again.
This would be much easier if Dukes got their Civil War.
*on Jan 29th, Dukes went Civil War Critical the same day Law Party went Civil War Pending, but if you look at the Influence level, Dukes and Dynamic Commodities went from a 4.1% difference to 2.9%. Perhaps that was suppose to be the trigger, but Dynamic Commodities didn't go Civil War Critical.