Your raider lacks a "hard" counter, which is necessary for having something that is immune to so many player defenses.
Good point. Radar Dampening could be switched to Cloaking. In which case Scout Starships/Tachyon Turrets + Missile Frigates/Turrets would completely own them.
Another kind of raider ship:
Cap: 48
Health: 99.000
Engine Health: 50
Armor Type: Refractive
Armor: 0
Speed: 188
Damage: 6.000
Reload: 2
Attack Range: 10.000
Ammo Type: Missile
Abilities: Radar Dampening 10.000
Immunities: Force Fields
Damage Bonuses: 1,8 Ultra-Heavy, 1,8 Heavy, 1,8 Medium 1,8 Turret
Cap Health: 5.040.000
Cap DPS: 144.000
Cap DPS With Multiplier: 259.200
Cap Total Cost: 88.800 ((1100+750)*48)
Cap Energy Cost: 9.600 (200*48)
Comparing to other ships:MLRS
Cap DPS: 166.186
Cap DPS With Multiplier: 332.373
Cap Health: 15.200.000
Vampire Claw (LoL OP)
Cap DPS: 197.120
Cap DPS With Multiplier: 591.360
Cap Health: 8.176.000
Range: Melee
Speed: 108
Abilities: Cloaking, Vampirism, Regen Time 01:30, Target Seek Range 5,000, Armor Piercing 10,000
Infiltrator
Cap DPS: 138.666
Cap DPS With Multiplier: 554.666
Cap Health: 14.880.000
An option for adding these raiders could be buffing Autocannons and Raiders. Hell.. just make Autocannons immune to Force Fields and give Raiders 5000 Radar Dampening.