I had a similar system to what you had a few years ago:
PM7004 amp, NA7004 streamer and Dali Lektor 2 speakers.
Like you I wasn't satisfied and bought a Chord Hugo. It made no difference to my set up and I hated the Hugo. It was really not user friendly.
I ended up changing my speakers and amp which made more of a difference.
On reflection, I don't think my original Marantz system and Dali speakers was so bad and in some ways I really miss it. Voices and conversations on radio and film sounded really life like and my wife used to think I was talking to someone when I was using my old hifi.
I get different qualities from my new upgraded KEF LS50 speaker and Naim Unitiqute/Roksan K3 amp but they have never been able to reproduce the life like qualities my old Marantz and Dali system was able to.