you can easily change any values of a hardpoint thru MPE...
if youre unfamiliar with MPE (i would recommend becoming so, in all honesty) then in the ship's hardpoint, you'd be looking for:
Torpedoes.SetMaxTorpedoes( ... , x)
Torpedoes.SetTorpedoScript( ... , "y")
where x is the number of torps, and y is the torp as found in the projectiles folder...