Please note that, like many CIEMs, the Miracle needs at least a couple of hundred hours of use before it settles into its real character of presentation, and that, again, like many CIEMs, it must be driven properly or the bass and treble will not be properly controlled. This is very important for balanced-armature CIEMs because they often present a very variable and very low impedance load to the amp/output stage which can be challenging to damp and to control effectively. It's entirely par for the course but needs to be taken into account to avoid disappointment. I say this from personal experience, since the Miracle was my first CIEM and hugely disappointed me until I replaced my Cowon J3 with an iBasso DX100, and then the Miracles absolutely sang!
Or you could have used Stepdance or another good amp.