For some real silly fun, restore it to the original self-destructive -15% CR per use. (I do not trust AI to manage that one.) For something really unbalanced, give it the forge hullmod boss ships like the Guardian have for unlimited missiles.
Current version annoys me too, and I agree it should be a built-in improved Missile Racks with quad ammo instead of double.
Also, the other combat missile ship, the Vigilance frigate, has Fast Missile Racks. Despite being a civilian, Venture leans heavily into missiles too. If Gryphon gets a quad missile mod, maybe Vigilance and Venture can have it too.