Not sure I've ever bought the idea of Romulans having "honor" as a defining characteristic. We saw some honor from the BOT Commander, but he was shown to be a relic from an earlier age and not in step with the rest of Romulus. The Commander from RI isn't exactly a paragon of honor with trying to turn Spock through seduction and bribery. (Though Kirk and Spock are equally unhonorable in their actions) Alls fair in Love and war I guess.Cunning and sneaky define the Romulans more than honor. Too bad the "Trouble With Tribbles" didnt feature the Romulans as the bad guys. The sneaky Darvin and the slippery/charming Koloth work better as Romulans than Klingons.
Honor works fine for describing the Romulans, if you think of it in terms of the Romans. Honor is a matter of supporting your home, your family and respect for ancestors. Also, it is in creating and fostering alliances and patronage so as to advance ones career in society. The Romans didn't feel any honor was impinged on by stabbing enemies in the back, that is more in lines with a chivalric code. They aren't operating on a medieval concept of chivalry, where one is expected to oppose ones enemy on equal terms or avoid lies and deceit.
But the Romulans need more then "Honor" to be a well developed society. What you described isn't in of itself make for a well developed society. I would be more interested in knowing out kind of government the Romulans have rather then more stories about honor. Are the Romulans a democracy or a dictatorship? Who holds the real power, the Senate or the Praetor? What makes the Romulans unique, because a lot of stories use them as generic bad guys.