Nothing to fix at all, then!
Think about what I said. I want to hear your opinion on it.
Sure.
So there are a lot of virtues to our current system, with a very granular, flexible, and responsive Cosa matched with a localized, small-bodied, and long-term Senats. Since the powers of the monarchy have been dramatically scaled back over time, and the judiciary is increasingly intermingled with the legislature, the fact that the Ziu is bicameral is one of a very small number of ways in our system to slow demagogues and corruption. You can't take over every institution with one or even two big waves of popular support, since you need several successive elections to be in legitimate control of both chambers of the Ziu.
All of those elements would be things that I'd want to see preserved in any prospective new system,
especially if the new system is being proposed primarily for aesthetic reasons (because people just like the idea of a Real Cosa more, as opposed to the virtualization of flexibly assigned seats).
Looking at what you said and thinking about it a fraction of as much as you, this seems like its main virtue would come in the reduced power of party leaders to enforce party discipline through seat allocation. Are there other benefits?