Which is why I will always have a problem with you and your SHBB's. You are talking about 'game' terms while I am talking about reality.
What would you rather have if you had the choice, one SHBB or two Lion class battleships? I would take two hulls over one every time (though HOI2 makes SHBB's far too cheap) especially if I had an Empire to cover.
Tactically, two smaller ships would ruin one larger one. The range advantage of an SHBB is pointless in reality in this era as hits were not recorded longer than 26,000yds. The smaller ships would be faster and would dictate the range of the engagement anyways. Positioning would go to the smaller ships as well by and large. The firepower advantage lies with the smaller ships as they have twice the rifles (although less capable) and thus a greater chance of the first hit. The smaller ships are well smaller and thus harder to hit. The list goes on and on.
Now, don't take this as to mean smaller is better (this isn't true one-on-one), that's not the point. The point really is that battleship design had reached a point where large increases in size were required to get even a small advantage over existing ships. This, as much as anything, doomed the battleship in WWII and the post-war period. There just wasn't much else one could do to improve them without massive expenses and huge increases in displacement. That is what doomed the Lion class in 1945 when there were proposals to build them then. The ship as designed had gotten up to Iowa class weight but the protection was found inadequate and a 12" deck was found to be necessary which would have forced another redesign of the ship (and a whole lot more tonnage added). Britain took the smart road and said to hell with it.