I've been dreading the shit out of the Siren battles on 1999 mode, but I am destroying her in seconds. Running Burning Halo & Brittle Skinned gear, combined with fully upgraded Charge and a stock shotgun absolutely wrecks her shit. And it beasts the shit out of regular groups and crows to boot. I've maxed out my shield & salts first, and am sitting on $4000. 1999 isn't nearly as hard as I expected, but it's also more fun than I expected. Now I'm just dreading the final battle lol, probably won't be as easy.