I'd have to agree with
@proedros here and suggest you may want to think about a different cable from those two option you mentioned.
I also saw that they were on sale, but my feeling here is that you may want a cable with rather different characteristics than those two offer.
Whilst I haven't heard it yet personally (but will soon!) Electech's Prudence could offer something a bit different at a similar price point ($249):
https://elementechnology.com/collections/virtues-series/products/prudence
@Deezel177 posted his impressions previously on Head-Fi, and I'll quote a sample here for you: "wonderful cleanliness, clarity and air. It had a pristine, serene and calming presence that came across graceful, effortless and light-on-its-feet. If it makes any sense, it sounded like a ballet recital, or a drummer doing butterflies on cymbals and hi-hats. It simply gave instruments this light, feathery-touch, but without becoming lethargic or sterile. Again, the cable had that tactile sort of texture I’d described earlier, that kept instrument sounding solid and corporeal. The midrange I thought was very nicely balanced with good body to the low-mids. And, the top-end was really rounded, rich and analog-sounding whilst - again - maintaining that sense of air. It’s almost like a baby Illiad in tone, really, and I’d surmise that it pairs most ideally with in-ears that are inherently dynamic or powerful-sounding".
I've seen you on posted Eletech's thread, so I know you will know who to reach out to for further details. They mentioned they might be doing a special offer after the upcoming Chinese New Year hiatus, so that's another bonus to motivate you
Otherwise, the Effect Audio Eros II ($279) could be worth a listen, as it combines copper and silver cables together and I think should maybe help to achieve the results you're looking for.
I actually reached out to Paul Zhang recently. I'd heard both Legend X and Nemesis extensively, and had finally chosen the Nemesis.
However, they have more similarities than differences, so my comments should still be helpful here.
I said I loved the Nemesis, but (like you) wished that I could add a bit more air, extension and lift to the high end, and upper mids.
Now my case is a bit different from yours, as I'd already purchased my Nemesis with a thicker gauge Ares II+.
So he recommended converting it into a thicker gauge Eros II+ (effectively just adding a Thor II+ to my existing cable).
It will be a beast of a cable, but I'm excited to hear how it sounds.
However, that recommendation leads me to believe that a standard Eros II could be a good start for you, and you could always take advantage of their occasional special offers on bespoke cables for existing customers, to upgrade yours to an 8-wire version later.
Anyway, just some ideas for you to consider, along with the other good suggestions already posted