I'm a bit surprised I haven't seen anyone talk about HQPlayer in this thread. HQPlayer has added correction settings for Laiv's DACs and it's definitely the single best upgrade I've heard with the Laiv Harmony.
I've since purchased a Holo May KTE for comparison and can say they're very close (but I believe the May is very slightly better if you're using HQPlayer). That said, I can see why some would prefer the Harmony.

