Right ear muffled in Lumity L70 R cShell

The right ear muffled thing has been happening in Phonak hearing aids for the last 3 pairs. I have just upgraded to Phonak Lumity L70 rechargeables. My hearing has not appreciably changed in either ear for 7 years. The right ear is just…muffled! Audiologist has changed cShell for two with bigger holes. Adjustments made to volume, gain. Still, no matter what we do, the right ear is just not clear. The left ear is crisp, clear. Right ear stays muffled. I do have over 40db perception in the base ranges in both ears. Dr. Google says that might be an indication of how to proceed.

Any ideas?