mellow marlin
Whisper and Voiceless can be a huge headache to do, and what do you get for completing them? Nothing. I mean sure there are badges you get for completing each difficulty which you can flex but.. that's it. That's not enough of a reason to give players a motivation to play these difficulties.
Perhaps give those who complete the difficulties unique clothes? I suggest giving one or two packs of clothes for completin Whisper which will be available on all slots afterwards. As for Voiceless you can let people get a custom made single piece of clothes of their choice available only to them. Perhaps that's too much but there are not many people who completed Voiceless, and either way I'm just givin ideas.
Although to make the rewards actually fair I can suggest the achievements gettin limited to solo completion to avoid gettin carried on Whisper and/or Voiceless for said reward.
cedar arch