Regarding the title problem,
I have historically been too hasty to go from “other people seem very wrong on this topic” to “I am right on this topic”
I think it’s helpful here to switch from binary wrong/right language to continuous language. We can talk of degrees of wrongness and rightness.
Consider people who are smarter than those they usually argue with, in the specific sense of “smarter” where we mean they produce more-correct, better-informed, or more-logical arguments and objections. These people probably have some (binarily) wrong ideas. The people they usually argue with, however, are likely to be (by degrees) wronger.
When the other people are wronger, the smart person is in fact righter. So I think, as far as you were thinking in terms of degrees of wrongness and rightness, it would be perfectly fair for you to have had the sense you did. It wouldn’t have been a hasty generalization. And if you stopped to consider whether there might exist views that are even righter still, you’d probably conclude there are.
The r/achipelago subreddit is quite small but exists for hobbyists to share designs for alternative political systems and to consider the effects the alternatives would have. Most of what’s there right now is about electoral systems rather than full institutional structures. Some posts include links to resources, such as one of my favorites, The Electoral System Design Handbook, which describes case studies of several countries and the typical good and bad effects of different design decisions.
“Ideal governance” depends on what ideals you’re aiming for, of course. There have been proposed improvements to futarchy such as this one, which picks utilitarianism as its explicit ideal. An explicitly virtue theorist option could be to modernize Plato’s Republic instead. Granted, these are extreme examples. For more sober-minded investigation into ideal governance, you’d of course want to start with criteria that are well-defined and pragmatic, rather than broad philosophical or ideological traditions.