Imo, Bloodweapon should be pushed to the forefront of DRK's design, not Delirium. So kind of agree with your alternative proposal but really don't think it should be cut over Delirium.

But they should actually keep Salted Earth and run with the concept. Make more of DRK's OGCDs more about DoT management. Of all the tanks, DRK is the best set up mechanically and flavorfully to be a health-sapping DoT tank.

I agree with weaker TBN as a matter of identity at lower levels. I also like the addition of shadow flare since DRK is one of the two mage tanks.

I'm kind of indifferent on Oblation. I like the animation and I've observed elsewhere that I actually like the OGCD healing bloat on classes like SGE just to allow players to create their own variety. I think Oblation serves kind of a similar purpose on DRK.