Missiles as my only source of HE damage is dumb, much like the old Hammerhead relying on Sabots as its only Kinetic damage. Missiles are relied on to give spike damage to take out a ship when you need it, not provide basic attack function, unless you are either a Gryphon or maybe an Aurora with Expanded Missile Racks and max Missile Specialization.
If I have no Maulers for HE, and I do not want to use a Safety Override build, then it is either the predictable medium kinetic and LAGs or don't bother with the ship.
For Enforcer, I tried Safety Override with three HMGs and two Chainguns. Dissipation could not keep up. Instead, it gets predictable two HMGs, one chaingun, and two flak.
For Hammerhead, the only reason to use HMG and Chaingun is if I want Ion Cannons or more PD in the front light mounts. Otherwise, two medium kinetics (HMGs or autocannons) and two LAGs are better.
P.S. Hybrid mounts on Hammerhead helped it, but only because ballistics are generally better than energy, and the Ammo Feeder synergizes with more ballistics. In particular, Vulcan is much cheaper, and often more effective, then beam PD, when limited to one or two mounts.
P.P.S. Sabots are brutal, back to their unblockable glory. If I want a 0 OP one-shot, Sabots will be my go-to.