Update on my experience so far. So I went for REM and adjustments yesterday with my UK audiologist. It turned out that the receivers was set at 85dB, so it was changed to 105dB. The REM was performed, and from that point additional adjustments were made including turning off high frequency banding to see if the flutter could be eliminated.
After I described the flutter issue, they said they had another patient with the exact same issue and they had tried everything to eliminate it even including turning the Feedback Optimiser off.
We tried different settings of the Feedback Optimiser, along with the Traditional Feedback turned on and I was still unable to have this off due to feedback. Low was acceptable.
I was unable to simulate the flutter upon leaving the practice, and was generally happy with the settings.
However, upon leaving the practice, I discovered I was having issues with whistling simulated by the environmental noises including handling my coat etc. I was not experiencing this in a quiet environment.
So I went back, and they did some more adjustments, including putting Feedback Optimiser on Normal. They also adjusted SR and as a result, it does feel a bit softer currently which definitely needs to be adjusted again.
But, I am no longer experiencing feedback AT ALL when cupping my hand against my ears, which for me is the strangest thing. So the moulds are a good fit for me, confirmed by the audiologist, which makes it even more confusing that I am experiencing this whistling. I am assuming it is the sound wave pushing through and then leaking back out?
Unfortunately, the flutter is still there but this is occurring a lot less than previously.
I was definitely not experiencing any whistling on my previous settings, so I think this is related to software more than hardware e.g. my moulds especially when I am not getting ANY feedback at all externally if I press against them.
I did think it was just me overreacting but it was slightly audible to others when it does occur, and is quite distressing for me.
Any suggestions at all where I go from here and what else they can look at on Genie2 to eliminate the whistling? Thank you in advance.