I haven't heard the C710 in a long time. The V3 isn't extremely spacious but it's really nice and versatile with good depth and layering. I don't think you'll be disappointed
Not that I've heard. I would think the ER4 is pretty safe - not enough room in there for a dynamic driver, which is what every counterfeit I know of has used.
CW31 has less bass for sure. Also not a trebly/fatiguing sound at all.
No set plans at this time but I may get my hands on an 8.A eventually.
What didn't you like about the fit of the A161P? It's one of the more comfortable deep-insertion earphones I've used. If that deep of a seal didn't work for you, the HF5 probably won't either. In that case I'd try something with a shallower fit, like the GR06 or Rock-It R-30.
Couldn't get a good over the ear fit with the A161Ps. I also sometimes like to lay on my side when I'm listening and the shell fo the A161P is a little large. Worried that a deep insertion tip may not be for me anyway. GR06 keeps coming up as a possibility but I did a lot of reading about Phonak 021/022s last night. Very interesting especially with the filters that change the sound signature. Might be a good starter for me so I can experiment and discover what signature I'm most comfortable with.
Besides relax time, I listen for hours at work, so comfort, isolation and build quality are important.