Don't Chaos weapons scale with humanity?
If that's the case then I'd be careful about that, as dying would screw you over magnificently. Lightning/fire might be a better option for a SL 1 run, as they do consistent damage.
I decided to just go with lightning. I'm stuck t +4 though, where can I get another titanite slab?
If you are still on the Four Kings, the easiest way to beat them is to just suit up in Havel's Armor, get the Ring of Steel Protection on, put the Grass Crest Shield on your back for added stamina regen, and use your other ring slot for whatever you want. If you have an Estus Flask +2 at least (which you should at this point) and at least 10 uses of it, you can just tank them. Make sure you have a high DPS though, 'cause you don't want to be fighting more than one at a time.
I got
so close two times. Once I was within one hit of victory when I got anxious and tried another R1. I'm fine with that; it was my own fault. The other I got grabbed

Yeah, I heard that works well but it's just too cheap. I want to be able to honestly say I beat them the right way. I guess I'll farm some souls for my pyro hand and find a slab for my club.
It really is demoralizing to get killed on your way to a boss..