Take a Common Beam Array. Note the increase in DPV going from a normal shot to a FAW shot. For example, going from normal to FAW1 does not actually provide an increase in DPV (DPS increase comes about because of increased RoF and multiple targets).
Take an Uncommon Beam Array. Note the increase in DPV going from a normal shot to a FAW shot. For example, going from normal to FAW1 does not...wait...what's that? There's actually a decrease in DPV going from normal to FAW1?
The difference will be the amount the Rarity would have increased the damage otherwise, as it increased the damage for the normal shot.
Conclusion...FAW is underperforming because of a bug where the Rarity of the weapon is not being applied to the damage of the attack.
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