User blog comment:Ofi123/Powerleveling kanmusus/@comment-861160-20140612132400/@comment-24978536-20141027175035

I don't know, I still find 5-4-A the best place to level Yamato-class aside from PvP. With a SS in the fleet, the chances that Yamato or Musashi get damaged are pretty low, and Akashi can heal that possible damage anyway. The fatigue is definitely a larger problem than in 3-2-A though.

I personally leveled my Yamato with PvP, but also with 5-5, where I used her as the flagship when I was trying to clear the map. She went from 32 to 46 in a flash, and even with those low levels her combat potential was just about the highest in my fleet.