Many thanks for your comment @pcm71. The thread started by your Sept 24 post on open, vented or closed domes is particularly interesting: Newbie, help choosing the right domes - background noise
Your audiogram is somewhat similar to mine and like you I find TV isn’t too much of a problem without hearing aids. As domes are cheap and easy to change I’m keen to try closed domes. Over the past few years that I’ve been wearing hearing aids, I’ve tried three audiologists with varying degrees of success. I learnt that skill of the audiologist is very important. For the Phonak Spheres I found another audiologist who seems better and who I hope will persevere with me to find the best settings, domes, etc. If so, it will be well worth their premium prices!