Re: crediting: yes, that system should work, we are discussing a guide to crediting in the staff forum however.
I would change the main air search radar on this to SK (the large bedspring set you have right now is the CXAM, a very very early air search). Since this is commissioned in 1944, I would add splinter shields around all the 20mm guns. You might also move away from the enclosed bridge to an open bridge (helpful for air defense). I would also raise the entire superstructure one more deck level. It would also be interesting to see an SG set above the SK, with a backup SG on a mast above funnel No.2. Might also investigate putting a lattice mainmast above the second funnel and mounting an SP height-finder for fighter direction.
Also, it's very doubtful that this ship would commission with what is essentially a pre-war boat complement; during the war, a large boat complement was found to be a hindrance and a major fire hazard (I believe one of the American CAs at Guadalcanal was sunk because its boats caught fire and gave away its position during the night). Plus the space taken up by boats can be used for more light AA. I would remove ALL of the amidships boats and replace them with a gallery of 40mm Bofors with associated directors. Alternatively, this could be displayed with a 1945 refit.
I would also move the large air search set to a foremast suspended aft of the forward fire control tower. That way your forward Mk.38 director has the required belowdecks space to operate.
It might do well to increase the ship's draft. Heavily armored ships like the American fast BBs drew a lot more than they had freeboard.
This ship could also use some directors (Mk.51 or Mk.56 would work) for the heavy AA (Bofors or whatever those are). One director per mount seems to be the requirement aboard larger surface vessels.
I would limit the searchlights only to platforms on the funnels as per standard USN design practice. Not sure why they were never mounted higher up (only answer that comes to mind is weight).
Put a 40mm Bofors at the bow a la Alaska for some nice flavor. It would be an extremely wet mount but IIRC the forward mount on Alaska was in a really good spot to engage targets coming head on.
I would get rid of those awful life rafts and replace them with the smaller version scaled to USN examples on some of my newer ships. You might also investigate reducing the liferaft complement and sticking to floater nets in baskets instead.
The turrets are very obviously "Iowa" and could do with some differentiation -- perhaps removing rangefinders from No.1 and 4 turrets, changing liferaft stowage, or maybe changing the general shape of the turret would help.
This ship has no armored conning tower! I would put one right forward of the bridge. You might surmount it with a 40mm gun mount again a la Alaska.
You might also investigate some centerline secondary guns superfiring over the main battery to engage aircraft head-on.