I see the Raider as just that. The AA ship capable of ship to ship combat. If we want a dedicated AA ship, you would see something like
Small base
Speed 2-3
1 blue, 1 red AA
1 blue anti-ship out each arc
3 hull
2 shields on each side, just 1 in back
2X Redirect, 1 Evade
Drop the red AA, and it's pretty good. Red AA on a ship means you can shoot at every stand at once. Unless you are talking ISD level cost for this corvette-sized ship, it's powerful enough to eliminate squadrons from Armada.
If you drop the Red AA it's just a flotilla that's probably a little less survivable. I like the single red aa on it. Spike damage but overall less chance for it. Depending on the arcs you could make sure it isn't easy to double arc wide swaths of fighters as well.