Triple U Boat can alpha strike hard, but they themselves are surprisingly fragile since they don't use focus on defense unless the alternative is death. Crack Blacks tear them apart.
I think Juke is pretty amusing against them as well. "Your Evade is downgraded to an eyeball. Oh look, you have a Focus token just sitting there." You basically make the Scout take straight damage, or you downgrade their offense for a turn from "best in the game" to "slightly better than a HWK with Focus".
I've been thinking about Overclocked R4 as a way to deal with mirror matches or lists that go for an early PS kill against scouts. It's worse than the R4 Agromech in general, but it can be quite good when one of your scouts is getting focused down. Spend focus on every defense roll and still get your torpedoes off with focus + GC. Then you're sitting on a pile of stress, but it's better than dead. Gives you a couple extra points for some of the cheap Scum crew as well.