Only heard the 990s a little- Q-Jays do have a bit of a treble peak (I think Brooko's review had a graph) but IIRC not so drastic, nor v-shaped as they have relatively full sounding mids and only maybe slghtly elevated bass- some people note sibilance I think depending on how they fit (prone to this w/ iems myself)- for me this is solved with the foam tips (includes medium comply set).
IMO it's a nice take on 'neutralish, but engaging'.
Ezekiel mentioned Earsonics which might not be a bad idea either- I haven't heard the sm64 in particular but have used two others and they seem to have that kind of sound down- perhaps with some different emphases depending on the model (the pseudo-graphs on their website seems to be reasonably indicative for my current model at least).
ICYMI- Etymotics actually recently introduced two new ER4 models, including one with a small boost in bass... maybe those could be better for pop?
Edited by Raketen - 7/18/16 at 8:46pm