The EM4 presentation is magnific but it lacks in clarity and detail retrieval. To me the EM4 are not anymore a TOTL. It's a mid-centric CIEM in terms of frequency response, not in terms on presentation.
The EM32 presentation is more "on stage" with a better openess and instrument separation/positioning. Detail level, resolution, top and bottom extension, to me the EM32 are the new EarSonics flagship and is clearly on the TOTL. The EM4 lack in treble extension and treble details, the EM32 are far better.
Both EarSonics products are focused on the global stage, to me it's pretty difficult to say they are bass, mids or treble focused. The focus is on the depth and width of the presentation.
The H8pro are completely different. They are as capable as the EM32 in terms of depth and width (but focus differently), detail retrieval and top/bottom extension. The EM32 can extend further in the bass department, conveying more power too, but the H8pro can extend far, not as far, but not as loud. The EM32 have sub bass like no other earphone I've heard, maybe too much for you.
The H8pro are not a bright BA based earphone, but when you come from a darker earphone like the EM32, they appear bright to you. This relative brightness is not my taste at high volume, oftenly when I'm outdoor, because it's quite agressive. The H8pro are perfect for low/moderate volume use, they are my slipper earphone. Then I contemplate my music. At the opposite of this use, the EM32. I use them especially when I'm outdoor, or when I'm active. No worry to use them at moderate/high volume, but they begin to lack in transparency at low volume. I don't contemplate my music with them, even if I can with no difficulties, but it's time to live the music.
Hope this help you