Good point.
Maybe the furies' power should be lowered a bit. And the damage should be distributed to the whole enemy fleet (each ship should get weighted damage maybe).
Or maybe the furies' power could be divided by 2 at each use, until they become feeble and useless.
Or... each use increases the chance that the furies turn against their current owner. lol.
There is at least a rumor that you don't get any points for enemies blown up by the Furies. I haven't tested it myself, but since reading that I've used the gong a lot less.