I like the hull guns and idea. But your designers have to be some of the worst ever employed by any navy. To make the amount of errors listed in your write up to the point where a brand new light cruiser requires bulges to regain stability requires a firing squad in your designers future. The Contuirt of 1950 is what the whole class should have been designed too. Have a look at the Italian Capitani Romani for a bit of inspiration.
Perfect designs aren't any fun and don't make sense historically. I don't really get why you're constantly berating AU artists to design these ships "perfectly" when history shows us that nearly every ship ever designed had numerous flaws, some more than others. Especially ships designed prior to the second world war.