Deathclaws are the only enemy in the game which still make me go "shit!" when they appear. I say leave them as strong as they are, they're the few enemies which actually need tactics to kill (I.e. run away, blast their legs with explosives and hope you cripple them before they reach you.
I never figured out all the different kinds of ammo, how you put different types in the gun, overcharged the weapons etc etc.
Still, at least in this one the combat shotgun isn't the world-owning weapon it was in FO3