Board Thread:Questions and Answers/@comment-11700680-20170920202000/@comment-24930367-20170920225736

3-2 leeching while leveling battleship/carrier flagship.

BB/CV - 3DD - CV/BB - Maruyu/SS. Or BBV - 4DD - SS, if you like it without Saiun.

This is kinda slow and really need rotations for DDs, but you can give EXP up to 9-12 DDs with default three preset slot. Obviously you need submarines to soak up hits so you don't have to spend buckets.