Sorry for the late reply, had a hectic time graduating.
I have found that there is some differences with the source and I have been switching between my warmer sources like the AP80 Pro and G7, and the neutral sources like my X7 Mk.II and TK-2. But the difference isn't that much bigger than what it would be for any other IEM I own. More power does improve things but not to anywhere near the same amount as it does with the Heart Mirror.
I'm using the white wide bore tips as well, they work the best for me atm.
While it's not a song that I'm familliar with I've had a few listens to it. I didn't get any hollow sound in the mids and it's indeed natural sounding over all. It has that live orchestra magic and the Shimin Li does convey that nicely. The violin sounds nice with a good tone to it, not too thin or too thick. Being a YT video it has some limitations in outright quality but that's to be expected.
I've had to look through my library as I have a 24-96 recording of Renaud Capuçon Warner classics studio session version of this song. It sounds nice and full on the Shimin Li, tonal accuracy is good without any real issues. The resolution is better without losing much of what makes a full orchestral recording magical. The lead violin does have more presence here compared to the NL Orcherstra version which can occasionally overpower other instruments.
I wil say I haven't been using the Shimin Li much as of late, having gotten the TRN TA1 Max last week.
On a sad note, it seems like my TK-2 has stopped working.
It won't turn on or charge.