I already made a post about the ST10S Black Gold versus stock M2S Pro yesterday:
https://www.head-fi.org/threads/earbuds-round-up.441400/page-3735#post-16448938 --> written in the last paragraph. They are sidegrades actually, so the M2S Pro isn't too far away from the ST10S Black Gold, and if you like the stock M2S Pro, perhaps you won't even need the ST10S Black Gold driver.
Don't have the Black Gold driver to put in the M2S Pro, but I'll try to buy one at the next sale.
Is there any particular reason why you want something > 50 ohm?
Anyways the
M2S Pro in stock form is neutralish with a subbass boost, it does have a bit of a boosted upper mids area, I personally am not bothered by it, especially with full foams on, but perhaps some sensitive to that area may.
The
Yincrow RW-2000 is smoother in the upper mids than the M2S Pro, but it has less subbass and is also much more expensive. Both it and the M2S Pro have really good technical chops for a earbud.
The
FAAEAL Rosemary is an L shaped bassy and warm set, zero sibilance but treble is dark, so there are some loss of microdetails and clarity. Also is 150 ohms so needs amping, sounds very meh from lower powered sources. I haven't tried the LG G7, so not sure if it can juice the Rosemary adequately.
@RikudouGoku 's favourite
Yincrow X6 must also be mentioned, if not lightning will strike! Great tonality and timbre, think of the BLON BL-03, but in IEM form. Not the best technicalities, upper mids and treble are relaxed.