7 beams and a wide-angle Q torp are the best dps config for a tac in my experience. The Q-torp is for a speck of dps that doesn't lower dps on your other weapons, so don't spend precious tac slots on a torp skill.

Also, don't expect to 1-shot people. (Unless you're a dreadnought and really lucky) Focus on coordinating with an escort to BO2 a shield facing then have him torp it to pieces.