Recently I finished a book about the Yamato's last voyage, A Glorious Way to Die: The Kamikaze Mission of the Battleship Yamato, April 1945 by Russell Spur.
However I read an interesting tidbit about Guadacanal, Yamato was considered several knots too slow for that voyage due to massive armor and thus Kirishima was sent instead and ended part of Iron Bottom Sound.
What would have happened had Yamato had several thousand tons of armor removed for speed?