Riot your Darius changes don't fix the problem

For reference, current PBE changes are: Decimate (Q) heal per champion hit reduced to 12% from 15% Decimate (Q) Maximum heal increased to 36% from 30%

Darius is strong because he's healing too much, and his mana costs are far too low. These changes only partly fix the former while at the same time making the problem worse in some scenarios. He absolutely crushes a number of matchups due to his almost trivial mana costs letting him spam Q over, and over, and over again. A majority of the roster simply has no answer to his endless ability to wave clear and harass. Why are you only touching part of the problem?