My responses will be numbered to correspond with your points

1) This is actually a good point that i forgot to consider. I think this would be easily fixed by maintaining the current 300 cure potency on souleater and simply bumping it up to 600 when enhanced by Dark Arts

2) you must have missed it, but at the end of Power Slashes description it says it would give you Darkside for 30 seconds, stacking up to 60 seconds, basically just storm's eye but it can stack twice, so my intention was for the skill to work exactly as you said it should.

3) Not true. This version of blood weapon works almost identically to the StB version, and Blood Weapon was by far the most powerful and important ability you had against large groups, you just had to know how to use it. If you used your resources properly, you could chain quietus and abyssal drain back to back for the whole time you had blood weapon active. Used in this way, blood weapon generated an insane amount of resources for you and allowed you to heal for an insane amount while dealing lots of damage too. The new aoe combo is the for when blood weapon is not available, essentially it replaces the utility of blood price by giving you something to do while blood weapon is not up.

4/5)Your concerns that you have for TBN and Delirium would not be a problem at all. In fact, the way those two abilities work negates the issue that either could cause on their own for DRK. If you spend MP on TBN and get blood back in return, you can never find yourself in a position that you don't have enough MP left because you can always turn it back into MP with Delirium. Another way to look at it is, if you have 50 blood but no MP, you can use Delirium to get the MP you need for a TBN, then once the shield breaks you are refunded, making it a 0 sum game, almost identical to how current TBN works. The only difference here is that now the neutral resource is blood instead of MP.

As for giving DRK a burst window for raids, if people are so adamant that DRK has one, they can always change Living Shadow to have a shorter duration but higher dps so that all of its damage fits into a 10-15 second window.

6) My version of DRK does generate MP more slowly than StB DRK, but it still generates a lot more than current DRK. Currently, DRK generates enough MP to cast 3-4 TBN's per minute. My version would generate enough to cast 7-8. On top of that, since TBN rewards blood which can be converted bacj into MP rather than strictly a free Edge of Shadow, that blood can instead be used to cast another TBN, letting you theoretically chain them infinitely if you get them to pop every time
So no, quantity of TBN's would not be an issue in the slightest.