Just with regards to the MP pool discussion: DRK still uses roughly HW proportions between Syphon Strike, DA, and your max MP. The problem with this is that MP generation is much higher in SB with the removal of Darkside's drain effect. This makes it a lot more difficult to "float" your MP between the two extremes, because you're required to handle a much higher incoming rate of MP. A larger MP pool relative to Syphon Strike/DA would give you more room to manoeuvre (due to the larger "storage capacity").

Blood Price is a bit of a wasted ability. Look at this bit of lore:

"So as I was saying, that heretic was fighting like a man possessed. Even after he took several wounds, he showed no sign of pain─though there was no mistaking the blood. As the fight wore on, it began to soak through his armor, spreading to every ilm of his body. But when it began to rise and envelop him as a mist, I realized it wasn't blood, but something dark and twisted..."

I understand the balance difficulty with an ability which gives you resources for being hit. It's bound to be either very powerful or very weak depending on how it's tuned. They could have just re-purposed it as a defensive cooldown - perhaps let its defensive power scale with the amount of damage taken while it's active. As you bleed out, it soaks into your armour, reinforcing it. Either way, I'd rather them change it if they don't think that they can safely balance it, instead of getting a deliberately undertuned action.