@jasbirnandra - have you considered that the Furutech plugs you are using may not be the cause of your harshness?
We tend to attribute the changes to sound to the latest system/cable change we have made, but in the case of power plugs, it might just be attached cable or the Interconenct cables that are the cause of the harshness.
But first, as others have stated - allow sufficient break in time - at least 100 hours,
Personally I use SonarQuest silver plated copper connectors for everything
Regards - Steve