thanks man. i'm extremely heavily considering these as a, well, every day carry, since my overears are pretty big in a bag, so i only wear them out if i intend to wear them the whole time. so a nice "backup" pair to live in my bag, so i can still have music even if i didn't plan ahead about my cans, would be excellent. plus this price point is, like, wow.
this is a long shot, but, have you ever tried aiaiai's tma-2 with "driver 3" option? i've had those for a few years now, and i like them because while they are absolutely capable of the thumping bass, they don't turn every somewhat low tone into massive bass indiscriminately, they only do it for what the artist clearly intended to be, yk?
i know the pair i currently use doesn't have a totally flat curve, though it is the most flat out of the multiple driver options that were offered. they still put a little kick into the bass and taper off the treble a little bit so the sound's not harsh. yk, not dramatically colouring the sound, but enough that it feels a little warm and friendly. it seems like these IEMs might be a pretty decent match (since i have a "type" of sound i like), but it'd be nice to know what you think if you did so happen to have tried out the tma-2.
you also mentioned good isolation, which is excellent, as sometimes i go out with my overears on but no music just to block out a lot of the outside noise. so it's nice to know these might be a good "backup" for that kind of thing too. (plus, much like you noticed about these IEMs, i find mine have the "open feeling closed headphone" thing going on, which is nice for keeping the outside out without the music feeling crowded.)
sorry if this message didn't make much sense, haha.