I think ljokerl did not include them because 991 Carrera 4S mentioned 'slightly brighter'.
I have only tried SE535 (both CL and LTD-J versions) and currently own the Noble 4C (not the N4) among the IEMs you mentioned. I don't think either of them fit the 'slightly brighter' description.
Yeah, I thought my other picks like the VC1000, ER4S, JH13, V6-Stage, and NT6 were a better match for "neutral-to-bright"+ analytical than the Noble 4S/SE535/W4. All good earphones though.
I have the VSD1S and was wondering just how much of an upgrade the Fidue A63 was over it. The way you explained it mirrors what I'm looking for: clear, good vocals (especially for females), and a bit less bass. Is it worth buying or should I get something else? I'm willing to spend up to $100, don't want the re-400 due to quality issues, and also think I want something with bass that's maybe in between the two.
It's hard to pick a winner between them because the signatures are different. The VSD1S is more v-shaped - it has more bass and sounds warmer and more full-bodied as a result. It also has brighter, more energetic treble and sounds more sibilant as a result. The A63 has less bass, more mids, and better midrange clarity because it lacks the midrange recession and bass emphasis of the VSonics. I should be able to say more in a few days as I'll be starting work on my final review of the Fidue sets but so far I've quite liked what I heard out of the A63.