Are there any potential better heavy cruisers for Britain that aren't in-game?

I’ve managed to grind out all of Germany bar the BB line in the same amount of time it has taken me to get to the HMS Norfolk because these cruisers are literally just destroyers with bigger guns. A Moffett can take out your turrets with HE.

I still have like 4 more of the same ship to go and some have some shitty 6-inch guns at 5.7 without even having the stupid high ROF of US cruisers.

Is there any potential for uprating current armour with add-ons, or perhaps some barely laid ships. I’ve seen the ‘Admiral’ and ‘Minotaur’ class heavy cruisers floated around?