I have the same hearing aids and the same issues. The VA audiologists have adjusted them multiple times and they sound good until they don't. I have molded ear pieces and I just learned that I can run a stiff piece of floss through the vent and out the other side to clean any wax build up. That and changing the filter often helps. Like you I cannot find suitable adjustments in the program options that make much difference. One last thing. They work great when I can blue tooth TV, car GPS, etc. Wish I could hear like that with normal speech.