Weapons emitter with burst currently triggers a FireEffect once. So I'm suggesting a similar toggle to UseAmmoPerShotInBurst which tells the emitter whether to trigger a FireEffect only once or for each burst.
FireEffect
UseAmmoPerShotInBurst
Lafiel Do you have your fire effects Trigger attached to a Turret or BulletEmitter? It triggers a fire effect only once if you tie it to a Turret but if you tie it to the BulletEmitter it triggers every shot in the burst.