There's the option of a 14-day Free Trial for a more bespoke, tailored version that lets you try out the paid version, which allows you to help with ear placement and the type of headset you're using. Maybe give that a try?
Failing that, you might want to let them know about your issues.

Have you even tried the generic Enhanced Audio option that's free for everyone in-game?
I have, and it's amazing how much better everything sounds.

Mine looked like this.