My Water score is actually with Herc, since I hadn't slvl'd Shingen yet. I have since done it (all but my pitiful Light now have their slvl20 Shingen Spear) aaaaand... I did less damage. Will need to redo that again as there was pretty bad RNG, but damn, Herc is no joke either.
Goes to show just how far a superior damage output Soul (higher damage per hit, more hits per turn on average, 3x 700k Nuke) goes, even if that means that the team's damage is lower (no team-wide +20 burst, no PF, no Multi-Shot Death). I was expecting to do like 50% more with Shingen, but now I'm expecting to do like 10-20% more, assuming better RNG.