If you haven't tried it, I recommend a knife-centric melee build

I was wandering around late in a Survival run, no mods and mostly but not even fully spec'ed for melee and knives, and this just happened. The deathclaw was a surprise, but you see how it turned out for him.

With Nuka World perks, SCAV! magazines and the right blade, Blitz II makes you unstoppable. I love this build, and I love this game.