Maybe is because of the lost of bloodbath, doing 2 pack pulls needs 2cds active, that's the only way I can see an feel better mitigation, also remember war is not doing as much dmg it suppose to so once we can decimate x6 we probably will see better results since the pull will die faster an we could save some CDs.

It is possible to decimate x6 but is to risky since you need 2 combos to get back to 100 rage.