I finally got a chance to try a Gryphon with max Missile Specialization, and while it can make ships disappear quickly, it was not as overwhelming as I thought. For soloing fleets, there are probably more efficient options. However, if you want enemies to die NOW, bring a Gryphon and spam Harpoons and MIRVs. If you do not want to use kinetics to attack shields, then Safety Override is useful for the Gryphon because the range penalty does not affect missiles, Gryphon will probably burn through CR to reload missiles quickly before peak performance is a problem, and Gryphon desperately needs more speed and dissipation.
If anything needs changing, the Gryphon special should have a cooldown to prevent accidental double-use.
Maybe the special could be limited to three or so non-renewable charges, and they do not remove CR. Missiles usually have less than full ammo at low CR.
Or... instead of a special, give the Gryphon a builtin hullmod that greatly expands capacity (like Expanded Missile Racks, but +200% capacity instead of +75%), then give it no ship system (or a weak one like flares).