I have not found a set of IEMs that can not be improved with Comply Foam tips.
While I’ve been trying a bunch of bluetooth amps out, the biggest single improvement I got with my aged set of Westone 3’s was simply by changing from some rubber tips to these Comply Foam ones.
Comply Foam fit my ears better and more comfortably than any other earbud tips. The Tx model also blocks wax from blocking up the sound channel. I’m a fan!
Make sure to get the right model for your headphones and size for your ears!