More micro details, slightly more bass, in particular subbass, slightly wider and deeper soundstage.
Maybe remold of my Etys is an option. However, I'm afraid that the remolded Etys will have worser sound that the originals. Additionally, after the remold I will end up with just one pair of IEMs and I want to have backup (just in case).
The ER4S extracts pretty much all the detail there is except maybe in the subbass where it doesn't have the greatest presence.
For balanced, accurate sound my favorite is the Hidition NT 6. Except for a bit of treble emphasis, it's got some of the clearest, most balanced, and most detailed sound I've heard so far. The bass is punchy and doesn't drop off (I actually think it rises a little in the subbass region) and the presentation is wide and well-layered, in contrast to the Etys.
I would agree with not remolding the Etys. You're not likely to gain anything and you'll lose the ability to vary the insertion depth.