Ah, okay.
In that case, this weapon would be slightly stronger than the Banshee and slightly weaker than the Hades against balloons, and almost the same power as an Artemis against hulls. This is considering DPS only, and I do recognize that you're building this weapon around the concept of its flight mechanics and possible spike damage rather than damage per second. 25 particles with incendiary modifiers means 25 20% chances to cause fire; this works out to an average of 5 stacks of fire per shot, or 10 fires in a matter of less than two seconds.
I'm guessing you expect the particles to spray perhaps in all directions? Perhaps within a cone based on the original projectile's flight path? 5 stacks of fire SEEMS pretty dangerous, though if those 5 stacks are spread around different components (or possible a few flew away from the ship, igniting nothing at all), then it doesn't sound too bad.
Actually, how DO you envision the particles' flight after the original projectile impacts with the target?