Along this point, the dk raid utility really should be equal between tank and dps specs. Time and time again, when grips are really needed, it’s often mass grip, with the most recent bosses being ovinax and fyrakk. Abom limb is not suitable replacement as it is not consistent, has a hard grip limit, and is not instant like gorefiends. Even for regular death grip, blood has a shorter CD. Dps dk should just get the blood equivalent to grip to be useful.
AMZ is the other point that should be equalized, but that should be as easy as putting an additional % modifier for dps spec only to match tank amz limit.