My personal Y-wing experience came through
guri (predator, thrusters)
cartel (title, mangler, hull)
thug (auto-blaster, unhinged) X 2
it's perhaps my favorite scum squad alongside Xizor's exterminators, but I need more time with them
So far, they've been run in several games against whisper + kath, and they've been the ones to drag whisper down both times (though it's really bloody difficult to get them in range 1, it's less difficult to corral the phantom into the arcs of guri and the cartel and then finish her off when she gets cocky/desperate). Most surprisingly, though, they were actually really solid against the firespray.
The basically 2 damage per shot is not at all bad when there's no lucky evades canceling damage, and kath isn't exactly a very efficiency points per health ship. Plus, while the range is puny, having the turret advantage still turned out to be very nice when engineering blocks (and, unlike feedback, you can actually use the 360 degree benefit without frying your Z like an idiot against ships with far more health)