Looking for a speaker cable with a relaxed sound.

to cure the sizzles... look upstream

as a general rule of thumb ... copper soothes, silver sizzles

Triode Wire Labs 

I’m ready for the haters, but one of my favorite speaker cables that did pretty much everything right and, had a nice slightly warm sound to them is the Cardas Clear Reflection.

Hi Mike

I don't think that a system's sound need to be tweaked with cables. 
Also, to get there will be a long shot in the dark. Chances are low to get it right from the first attempt, if any.

The right way to go, is to use a cable that fits your system.
For that, I need the following data:
Your Amp's DF and the length of the required cables.

The calculated cable, will be a perfect match to your system and sound better than any other.

Cables are no different when it comes to system synergy. You need to balance everything out.

Not like that. If something is too forward, bright, rolled off, dull- you name it, whatever, does not matter - you suck it up. You live with it. Make the best of it. Because nothing is perfect. Everything has its faults. Its hard enough to find something with the least objectionable faults. The absolute last thing you should ever want to do is deliberately go looking for faults. Which is what you're talking about. Its a recipe for failure.