Ginkapo raised the raider's biggest problem, they just melt too fast with no way to spread damage around. I'm slowly learning how to use the raider by running a scarred one in my campaign. Avoid all squadrons and ships that are not Floatillas, at least until very late in the game.
I'm hoping we get an imperial officer in a future expansion that allows a ship to trade a defence token for a redirect. An officer like that would only really help the raider.