Oddly, I had the SAME thing going on after REM fitted Phonak Lumity Life aids a year ago. The sound quality was HORRID: flat, like someone blowing over vellum paper. Harsh, no rich sound, like every word ended in a sharp RAP with a knuckle on metal.
I ended up taking my older Marvel aids in to the audi. She got on the phone with Phonak and was walked through transferring the entire program and settings from those aids into the new Lumity Life aids. That got me 95% to perfection! From there, a few more tweaks and a dedicated “Music” program, and I’ve been happy ever since.
Many people rave about REM and the tone test, word comprehension all that used to SET UP the aids. But the real test is when you put them on. How does your world sound? If it’s not to your liking, you have to shatter the accepted recommendations and articulate what you want boosted. For me, I traded off the sharp higher frequencies for more richness and bass. Personal preference, but it instantly turned my aids from tools that made speech comprehension impossible into ones that made speech EASY to comprehend.