Board Thread:Questions and Answers/@comment-11700680-20170307042318/@comment-26154973-20170307055412

Uh, that is 2520 exp. for 5-3 :) But usually you retreat on first or second node (subs tend to go to B, which is free), have to repair (if you go to C or continue after B), and use a single sub.

5-4 is around ~2K exp. per run (you go BFILNO with 6 subs, one run is about 4-10 minutes, not sure if it will work with low level subs though).