Welcome, Sky!

My personal feelings are that a new receiver is not going to change things much. Admittedly, others feel different.

Axiom speakers are very "revealing" in that they sound wonderful with great recordings. But you'll know when you have a poor recording as well. Are you sure that's not the case with those few tracks?

Also, have you played around with speaker positioning? Is the room "bright" or is there some sound dampening available in there?

::::::: No disrespect to Axiom, but my favorite woofer is my yellow lab :::::::