Your description reminds me of every time I have heard KEF speakers, especially the LS50. Bright, hard metal tweeters aren't helping. Try a speaker with a folded ribbon, like a Golden Ear stand mount.
As for DACs, I tried a bunch of ESS chip DACs and found them all glassy and hard sounding. I ended up with a Denafrips Pontus II. I tried to avoid Chi-Fi, but after trying cheaper DACs from Cambridge Audio, Project, FiiO, and the Schiit Gumby, I gave in and got the Pontus II. Still breaking it in, but it seems to avoid that harsh, glassy sound without losing any detail retrieval.