Firstly, as regards the Slug-kinden, you might want to go over the short story "The Dreams of Avaris" and, for that matter, there's some more heavy hints in the upcoming "Heirs of the Blade".

Secondly, the Moth-kinden were more reliant on, and more proficient with, magic than any of the other Inapt races (save the Masters of Khanaphes, who were already in decline by the time the Moths reached their apex). They never had a strong administration or political organisation, but individual Skryres and groups of them simply ruled their own parts of the world and intrigued against one another. Their Mantis servants, and their Apt slaves, were kept in line by the threat of their magic (see short story "Queen of the Night" for a glimpse of this). When the revolution happened, the most important thing was not the technology so much as the empowerment it brought to the Apt — magic (and the Inapt world as a whole) is subjective, as opposed to the objective Apt machines, and the Apt kinden's belief in their ability to overthrow their masters brought the Moths low very quickly. As for reclaiming that power, that's another case of FOIP (Find Out In Print).

1. I don’t know this for sure, I’m not the author, but I have a strong hunch that Khanaphes is the last holdout for Slug Kinden. I don’t really see them having as strong an influence anywhere else. Please correct me if I happen to be mistaken.