Thank you for your insight. My warrior is already leveled and pretty well geared so that's a semi moot point on the leveling. I ran the warrior as a test for 1 pull against Normal Ursoc just to see difference.
https://www.warcraftlogs.com/reports/TWng2JPzdM3vf9Vk#fight=2
DTPS
DK (846) - 285, 389
Warrior (824) - 168, 348 - 17% wipe
The information on having to basically constantly keep Vamp Blood(VB) up and pooling RP helps alot. I thought of VB as more *bigger* cd than that.
The overall fear I have is that the other tank being a DH puts us both running *reactive*