Clearly, Kobalts are overpowered. I suggest lowering their fire-rate to 225 RPM from 550 RPM, and also only be able to shoot straight ahead, none of this super-maneuverable aiming with mouse.
That's all on the pilot for not quickly afterburning out of there. Most likely on the map screen putting down a waypoint.
The Flash can pass a vehicle shield? Did that have something to do with the "shield stabilized" message shortly after that?
If you find a video showing the action from the Reavers pov please post. Be nice to see what else shot him.... A video showing you delivering the final blow is just that.