Italy has completely rethought the strategy of the 1920s with a view to reducing costs. Building and maintaining 9 large, modern battleships would be nigh on impossible.
Instead squadrons are centered around Armoured Cruisers, with light cruisers and destroyers in company.
Indian Ocean, deploy 2 SAG(Surface Action Group) which are able to resupply and repair from Mogadishu and Massawa. Made up of 1-2 ACRs, 2-3 light cruisers and 6-8 destroyers. Bear in mind the long range of more modern destroyers in order for them to be effective for oceanic escort. The SAG gives reasonable firepower against larger ships with torpedoes and excess speed, effective AA defense due to increased training and good positioning, some anti-submarine capability from the modern destroyers, good range of operations from seaplanes onboard the cruisers. Also probable to combine two SAGs to act enhance the ability of a battleship/carrier.
Carriers, the large carriers are strike-heavy, with about 4:1 in favour of the strike aircraft. This may not provide adequate defense or scouting ability, so the much smaller carriers which only operate a handful of fighters or scouts.
It all ties together reasonably well, it just hasn't happened yet.
The example of Pisa is bad. Italy didn't want to build heavy cruisers with 203mm guns so instead built a massively gun-heavy light cruiser class to do the same job on less displacement. The other light cruisers are better suited to scouting roles, or acting as flag units for overseas operations.
The USN shool of thought with favored a fleet that was design to fight as a single large unit.Were every ship had a job to do and everybody had there place in line.
The problem with that is that the USN had a fairly clear enemy, so they thought up a way to beat him. When the IJN didn't line up nicely to be blown out of the water the US planning sort of went to pot. What sounds more threatening?:
"Attack me and I'll come kick your ass."
"Attack me and I'll go away to build some more ships for 6-12months, then come and kick your ass."