It is very simple. Melee should not have 4x the dps of a dps caster while also having the AoE CC utility of a dps caster.
Not only is it very simple, the ability itself is bugged, and the DC is too high by 10, causing it to succeed 50% more of the time than intended, which is throwing epic feat selection and the power between melees (such as monks) and every other source of dps in the game out of whack. As stated by Steelstar:
If this is something you would like to fix, just leave the class level 29-30 part, and add a -9 modifier at the end and make it close enough.
This is causing nerfs to be directed at melee classes such as monks, which is ruining heroic class balance, which was already dominated by warlocks. The problem is high level melee, and as such, bug fixes and nerfs should be directed where they belong.
It will also fix all the melee complaints about a lack of CC against undead and other targets if it is converted to a non-helpless 3 second knockdown. Reaper mode is supposed to be about teamwork, not someone using bugged dire charge to solo R7 to replace CC classes with a higher dps melee class, countering the reaper mob saves increase by the bug, and using bugged self-healing that also isn't supposed to bypass the reaper penalty.