I'd audition some other streamer/DAC combos... sounds like your setup mechanically is good, so don't move anything. I know my testing of a few streamer/DAC, from Bluesound Node to ultimately a Lumin X1 that I bought, you will find very different levels of transparency. I was chasing my Vinyl side, but now it's not even connected. The Lumin DAC sounds like vinyl only quieter to me.
Maybe you can find one that sounds good in your setup as-is...

