In that case, let me rephrase a question we've already been asking amongst ourselves for some time now: How do YOU see us using
in a sub-35% situation?
For every theorycrafted result we've simmed/tested so far, we've estimated that its gain is so strong that sitting on a Death Rune just to match with the cooldown is more than worth it. Not using it off cooldown is a loss. Thus, it dominates our rotation completely and frankly makes for rather unenjoyable gameplay, given how antithetical holding back runes feels.
As such, we're also getting numbers higher than your stated 7% for Unholy and 4% for Frost- far higher.
This is one of the primary reasons why we're so slanted towards generating and maintaining Death Runes as constantly as possible, and thus why we say talents like
and Plague Leech being mandatory.
Is there something radically different we're doing than from what your internal numbers show you?