There's Selectorate Theory. I read The Logic of Political Survival and I've been working on and off on a post distilling the theory. The theory seems very good to me (At the very least a great start), but I wasn't satisfied with the resources about it.
The Logic of Political Survival is a long and somewhat difficult book, and the Dictator's Handbook, though I only read parts of it, seems to not give a full coverage of the theory. one of the motivations for my post is to have a resource that's more accessible but touches on all aspects of the theory. I hope to get back to it after I finish the post I'm currently focused on.
I'm also eagerly awaiting the full version of Nassim Taleb's Principia Politica, of which there's currently a short draft version online.