There's a couple interesting ideas here, though some are a bit awkward still and I'm not sure you entirely thought them through.
For instance, you don't cover what happens to Dark Arts or TBN's CD, but say TBN's "not tied to damage". You also have the 10% reduction innately stacked with the barrier on Oblation, making it slightly harder to break the barrier, creating minor anti-synergy with the healing effect you wrote for Edge/Flood.
Dark Mind isn't quite as useful as you would hope for Walking Dead, considering that you're still expecting Shield Healers to use GCDs on a DRK, and the idea of a "helper CD" just means having to burn two CDs for the price of one.
Also, what happens to the "healing Edge/Shadow" interaction when you Dark Mind and Oblation...?
Your Enhanced Unmend only makes a difference in combat once. And only if it's the first action you use it at the start of the pull.
It's also unclear what you mean with this execution, since you mention it's on Plunge rather than on Unmend, which means... what exactly at the start of an encounter and you can only use one of the two to trigger it?
(And forgive me my ignorance, but what's the issue with "wasting 600 MP on Hard Slash" that this fixes? I assume you mean to have Unmend to cycle the first GCD so you can burn Edge/Flood before Blood Weapon, but then you have a double-weave and you'd still "waste" MP from Blood Weapon and... argh my brain.)
Abyssal Drain not healing instantly is also an issue, since even with the heal you wrote on Edge/Flood, it's still our snap heal for W2W.
I could see, however, putting some "Sole Survivor"-esque marker on Carve & Spit if they're going to remain tied together, if for no other reason than to distinguish its effects from AD while maintaining parity based on the encounter, allowing you to choose how you want to use the cooldown for max benefit. Perhaps even folding it into some kind of Excogitation for DRK -- mark an enemy, and if you fall below a certain health threshold, you instantly "counterattack"(!) and drain a large amount of damage from that target to heal yourself. Useful to pair with LD too, much like HoC with Bolide.
Also,
I have no idea what you're saying here.What to do with Abyssal Drain and Delirium?
Delirium can be a combo that normally consumes blood ( 25 each action? ), but you can use it for free under Delirum.