System assessment...

Congratulations on retiring, and on having a great system. I have been retired for about five years now and my system brings great joy to me. I first upgraded prior to retirement and then again about a year after. My progress in the last decade or so have been to move to more musical and natural sounding systems. You can see my systems under my userID 

The largest influence for me was having season tickets to the symphony for ten years 7th row center. I became aware of how my system focused on detail and slam and the presentation was not like that of real live music. All of this pushed me more and more towards all tubed components and Sonus Faber speakers. 

Now that you have the time, consider going into the city for a day or two. Make appointment to hear systems at high end stores... explain what you have explained here. Have them assemble a system for you to listen to that they think you will find appealing. Maybe visit some audio-goners. Being retired, no reason not to travel. Hearing the kind of thing you want will help point you in the right direction. 

I have Fidelium speaker cables, but I have no experience with your other components. The Fidelium added detail to my system, but not shrillness. Sibilance, etc drives me nuts.

I’ve had success changing things by varying cables and vacuum tubes. What type of cables are you using? Have you done any tube rolling? I can add a bit of warmth by tweaking my subwoofers, but that does nothing for high frequencies.

It looks like you’ve selected some very nice gear.

@larseand 

You do have a nice system.  What do you want to change? What do you think your system lacks?

As a retired person learning about streaming music will make one’s life easier. I’m pretty sure they invented it for old folks. 

Maybe it’s your room. You never mentioned if it was treated or not. Do you have tiled/wood floors? Windows? These things would make your room more sterile sounding.