I think you're referring to the Harman IE 2019 target, which is way too bright for me and not neutral at all. It makes me curious to read that you don't like it either, yet you like another treble-heavy IEM.
I think your description of the upper bass and lower midrange lacking clarity and separation is mostly due to frequency response, and that is eqalizable.
I will look up the IEMs you mentioned as I haven't heard of them before.
No, maybe I explained myself badly!
I don't like the Harman target because he tries to bring all musical genres together, without maximizing any one, according to my listening experience.
I don't have a specific target curve and my preferences are based on mood and music genre. Remaining at Final Audio, I have both the A4000s (which I will soon replace with the A5000s because the A4000s are starting to show the wear of time), E5000 and F7200.
They are so different from each other that they cannot be compared, but each of them has qualities that I adore: E5000 I wear them when I want to lie down in bed and relax. Although it has a lot of bass and a warm sound, it is very defined, so I don't miss anything of the track and they are the only IEMs that relax me to the point of falling asleep. A4000 have a lot of treble and a lot of air but also a very good bass and with instrumental music, soundtracks, Trance, etc... it is excellent! The soundstage looks like my HE400se and even has better imaging. F7200 is a total disaster with EDM or Trance music, but the tracks focused on vocals and with few backing instruments, are the most realistic I have ever heard in an IEM. RE800s are a little more balanced than the A4000s and better suited to many types of music genres. My Cadenzas are a Harman curve, leaving aside a few slight deviations: excellent IEMs without a doubt and they do well on all the tracks you throw at them, exactly like Zero Red, but I ALWAYS feel like I'm missing something. With Zero Red I tried to bring out the air and I ALMOST succeeded, but I had to sacrifice the Timbre. Without EQ I prefer Cadenza to Zero Red, which is why I gave the Zero Reds away.
With parametric EQ (which I often use) you can fix small flaws or preferences, but you can't change deeply. Obviously this is my opinion and I am ready to change my opinion, but for now it has been a failure...
I bought the Zero Red out of curiosity and tried to "understand" them, but I kept thinking that they were similar to many CHI-FIs released in the last 2 years exactly like the Cadenza (too much redundancy), but at least the Cadenza are very comfortable for my ears and they cost less.
They are fine for walking in the center of Milan, but when I leave the "La Scala" theater and go home with still a bit of desire to hear music, I want something that can give me at least 20% of the emotions I felt at the theater and Zero Red, Cadenza, etc... they can't give it to me, sorry. Seeing how the IEM and headphones market is going, I decided that this Christmas I will treat myself to the A5000s to replace the A4000s and the Arya Organics to replace the HE400se; then I'll stop worrying about any other products for a few years.