I actually spent a few hours with
@ceeloChamp so I got to hear his, and he had the fir demo units. Even just between us, things that were comfortable for me, were uncomfortable for him (such as the fir IEMs that I thought the fit was perfect). The Z1R is definitely not a great fit for me, but I have just persisted to the point that I found a way to make them ok. The solaris I likely could find a way too, but I could just tell immediately it was going to hit some of my pressure points. Still would have liked to compare the SE to the regular though. I also found them fairly similar to the andromeda gold, especially in terms of soundstage and things like that. The solaris had the edge for me in bass, even though it maybe wasnt quite as much in quantity, it definitely had more of that DD quality that I have now come to realize is pretty much essential for me. The golds though I have also come to realize maybe have some very very slight distortion (maybe, not really sure if its that) in the treble potentially due from the crossoverless design or the acoustic chambering, but its something I actually find quite pleasant. Almost like going from the solaris ultra clean sound, to something that feels slightly more... lively.
I actually got to try out the M4 too, and again based on what I know of your preferences it might be more up your alley. I think all of these are quite similar actually. The M5 wasnt too different from the solaris, and the M4 itself was actually very similar to the M5, but was missing a little bit of sparkle up top compared to the M5. I personally preferred the M5, but again the price is just killer. And since I thought they were all more similar than dissimilar, and knowing that you seem to be pretty completely satisfied with the solaris SE, my gut would again say likely not worth it, at least not without a demo first.
As for the VE8, I have yet to jump on the custom train, and had some difficulties when I tried to get impressions done. And it seems like finding a universal version is not exactly easy. Plus honestly, even though I am looking at the tia trio right now, my goal is to cut down to maybe 2-3 high end pairs and just kind of let myself be happy. Which, I kind of am... but damn if that desire to just try them all out doesnt persist.