Yes, I think there are further options to pursue with the molds. If I push on the mold in my left ear hard enough and get my mouth in the right position the effect I am hearing can be significantly reduced at times. That suggests feedback issues. The fitter says in all her experience she has not seen anyone go to the small pressure vent and silicone material and not stop the feedback. She says 95% of her clients use hard plastic and still get the feedback stopped. Don’t know.
The really weird part of this whole effect is that it is worst when the audio quality of the source is not the best. For example when some reporter in the field is talking using Skype or a satellite phone, or something other than studio quality microphones, the lost sound quality effect of that seems to get exaggerated big time. It was the very first abnormal effect I heard with these HA’s from day one. I made a post here about it calling it the vocal fry effect. Still have it today. Still sounds the same. Not all voices do it, but some, including my own at times, seem to be brutal.