Gorget = soul
Ouroboros is pretty nice, good 2ndaries too, definitely use that, CHD for LpH, and yes, sockets are a MUST on jewelry, I don't care what ammy / ring it is and how it rolled, gotta have a socket.
Yes, on your shoulders get rid of Revenge for Vitality.
If you're shooting for high CDR build w' Obsidian then you'll wanna use Gogok in your Ouroboros, if you like where your CDR is at then use Pain Enchancer, and yes it's still a great gem even for BK swords.
If you're going for the high CDR version of BK / Waste w' Obsidian (which is the most powerful build) then you'll want CDR pretty much everywhere you can get it, including 10% on your swords.
Your gear is pretty solid, for your para lvl, buuuut
Ideally you want Elite Damage Reduction on your chest w' Str / Vit, I know that's not possible with your current piece but for future reference, and your current chest will suit you fine for a while, life regen isn't a complete waste but not what you want there.
CHD for Res on your gloves
Better Reaper's w' element % / str / vit / chc
MS for Res on your booties, when you find them, keep the WW damage though, you want that on your helm and boots, your helm is perfect, aside from better rolls ofc.
Ik belt has the right rolls but try to find (gamble) a String of Ears. Chilinak's Chain, Witching Hour, are also great alternatives, for the right situations. Chilinak's for speed boost and Witching Hour for more dps and possible IAS Dust Devil breakpoint but only if you can sacrifice the defense. Go for SoE
CoE, res should be replaced with CHD, you'll want CHC / CHD, naturally.