One option Bossk has (and it's an interesting one despite making the Mangler pretty much mandatory): get Expert Handling. Large ship barrel roll + Tac + 180 arc is flavor country. You're probably going to be looking to do greens most turns to get the most out of K4, so what are you worried about?
Aye, stuff like this is why I don't rule out the Mangler, it's absolutely an acceptable option but I'd say only if you need that EPT slot for a specific reason (like this one). To get the most mileage out of it, you're going to need some re-positioning abilities on Bossk. A fun, and still not prohibitively expensive, build might be something like:
Bossk: Veteran Instincts, Mangler, Navigator, Maneuvering Fins.
A meager 44 points gets you a PS9 large ship that can re-adjust to large chunks of its dial in response to your opponent's movements, which in turn makes it easier to keep that Mangler lined up (not to mention just generally making the YV-666 harder to pin down). Same price in Fins n' Navigator (the "Alligator" I like to call it, cause lizard guy with Navigator) as an Engine Upgrade, but EU is much better for getting out of dodge than re-aligning your own shots (though both builds can, to an extent, do both).
And yes, I'm really fond of Maneuvering Fins with Navigator. On their own, the Fins are kinda crap. Navigator opens up the ability to pick from 1/3 of your dial. Got yourself a poor man's Fettigator right there.
Moralo is the hardest YV-666 for me to think up a proper build for. Bossk is a bonafide Ace in my book, Latts has Crack Shot-lite ability she can use all game long, Slavers are silly good blockers (and a lot of HP for a cheap price!) Sure, HLC is nasty and all, but it's pricey for a ship that only has one agility. Part of me kind of wants to throw an Ion Cannon and Tactician on him, maybe run him with Dace Bonearm. Could still squeeze in either a third named pilot that isn't too crazy or a pair of Zs... maybe with Bug-Zappers.
