i think they should first
1, have an appropriate cable - the microphonics for the FLC8S is a disgrace for an IEM at this price - you basically can't walk anywhere with it if you want to enjoy any degree of quiet music
2, Invest a bit more time in tuning - the dynamic driver doesn't display any of the tight deep bass that I would expect from this type of driver. If they told me they had forgotten to wire it in in my headphones i genuinely would not be surprised!
The mids are sublime for sure and the seperation and imaging are lovely but the bass leaves a lot to be desired
The bass would be as expected for an armature driver, 1 or 2 and if the headphones was meant to be a more neutral flavor but...
I tried all the different combinations. Today I tried black LF filter with the clear one hoping this would allow a more defined punchy bass.
It sort of achieved this but the bass was very warm.
I still enjoy the IEM's with greys & red but its sad that they came SO close to making a 100% winning headphone
For old Verve Jazz recordings such as Billie Holiday though they do sound exceptional!