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.
I did the er4s custom reshell and lost all the transparency I loved about it. Ended up buying another pair.