That bump in the 16k range works well for me. I too was concerned about it before dropping 2.5k on it. I went online and listened to test frequencies in the 14-18k range. I could hear them all, my 48 year old ears somehow came through. So I was really nervous that peak with the Volur would be problematic. Turns out they sound fantastic and sparkly to me. I have zero issues with the the treble peak with the Volur.
Just goes to show you, you gotta demo things yourself, or you could be missing out big time, or you could be saving yourself from the wrong purchase. I gambled and it worked out amazingly for me - as after comparing them to quite a few 3K and up IEM after having them for a while, I did not find a one that unseated them for me, just ones that could complement them, but nothing that made me want it more.