After a couple of hours or so, the bass has really improved substantially. The bass guitar in Steely Dan's Gaslighting Abbie is incredibly articulate and deep, and Near Wild Heaven from REM is sounding very solid in the bass guitar too. The more I listen, the more impressed I am...and the resolution is phenomenal across the frequency range
I think your brain is coming round to the fact that bass quality is more important than bass quantity
Thankfully these iems don’t have more bass than the music intended, but do have extremely good tight or solid bass when required.