I see that you have been deceived by the extremely high hype for these HZ Sound Heart Mirror. Maybe you had to find out in advance who likes such a sound. These are usually people who listen to specific (and very calm) music that relies on great detail in the high frequencies.
I for one usually listen to hard rock and heavy metal where high frequencies are much and very pronounced. And I cannot even imagine to put IEMs as Heart Mirror into my ears. Bands such as Iron Maiden or alike with two or three screaming guitars, cymbals, piercing vocals and so on will deafen my ears as soon as I do it.
I am not saying HM are not good. I just say that different kinds of music styles need different kinds of earphones.
Btw, I don't like DT-6, too. But that's another question. As long as I remember I was hyped for 6 months about these Sen'F'ers. And when I bought them and put them in my ears I was very disappointed. They were not for the music I usually listen to.