Valkyrie's broadsides

I've been looking at the Valkyrie and trying to figure out how to best take advantage of her broadside hardpoints. They have a special quality of being triple barrelled, where the equipped weapon deals 40% less damage but the DPS is multiplied by 3. They also have limited space (1) so trying to pack as much into them is crucial. I'm leaning towards energy weapons if only to not worry about running out of munitions during combat.

Does anyone have any suggestions on custom weapons for these hardpoints?