Ok, I let my Fearless S4 burn in over 30+ hours using the JLab burn in file on repeat and the game has changed entirely. The highs smoothed out so much and the low end seems to be hitting harder than before. Then I added a copper cable and I fell in love. It improved the highs and the stage and for the first time I felt they bested the DM6. I'm going off of memory, but they are close to what I remember the DM7 sounding like.
All the above is great, but the sad news is that I'm probably still going to end up selling these beautiful IEMs after DHL gets my replacement DM7's back to me.... The S4 hurt my ear canals after only an hour of wearing them. I've tried New Bees, JVC Spiral Dots, Symbio Peels, and some blue KZ-a-like tips and nothing helps. I just don't think they are right for my ear canal and concha. The BGVP DM6/7 just fit so me so much better. I can wear them for hours on end and have no issues.