The first time the criticalbonus system launched was version 4.5.3, at which time the criticalbonus of rare BB was KM 28. IJN 27. SN 25. USN 25. RN 25.
Almost all Italian and French warships use the FCS of the five old countries, except Richelieu. Before version 4.5.3, Richelieu used Soviet FCS. But Richelieu players can easily allocate equipment to the FCS because there is no need to upgrade the main gun. In order to balance the game, programmers designed a third upgrade FCS data exclusively for Richelieu, with critical bonus only 20.
But then the problem arises. Later updates have strengthened the critical data, and the FCS criticalbonus of the old five countries has increased by 5. Except for Richelieu's FCS. (The first and second upgrades of the FCS in Richelieu are still using Soviet data, so they are enhanced)
I think maybe the developer forgot about the new FCS.
The reasonable data of Richelieu third upgrade FCS should be 25.