Need "warm" interconnects advice

"... I worry and analyse less about sibilance or other untoward sounds on less pristine recordings and hopefully just enjoy the music."

Congratulations! It certainly took me a long, long time to finally get away from too heavy a concern with pristine sound and all its "glorious detail" and supposed neutrality. Best wishes for continuing musical enjoyment, regardless of the level of coloration..

The Gabriel line of cables did what you ask for in my system but I prefer more detail at less expense. For far few dollars, try a used pair of Cardas Cross cables (thick and warm).

More detail with Cardas ICs? Now that's hilarious!

As for determining neutrality of an IC, if your system has a tape loop, put the IC there and then flip the switch to "Monitor" for that tape loop and notice the difference between the switch engaged and not.

All of my auditioning and purchases over many years tell me that staying away from silver gives you a chance for warmth. If you use multi-strand wire then it should be Litz and if you like the warmth of Cardas and want better detail then think about Lessloss Anchorwave.

To get where you want to go you'll need good power cords as well. Lessloss DFPC is nicely warm and their Signature loses some of that in favour of better detail and bass grip.

Good silver is very expensive. But silver can even create a warm and involving sound as well. Like the Accapela pure silver interconnects. My new Audioquest Wel Signatures also sound very musical. They are very expensive.