The amp you have is known to be very detailed, neutral and on the analytical side of the spectrum. This is why the older Transprent was appealing… it wasn’t as neutral.
I actually don’t agree with this as a long-time owner of an SMcAudio amp, and the DNA 500 was the pinnacle of Steve’s stock creations and was not at all pegged as “analytical” sounding. If anything it’s probably your Focals that are leaning more to the analytical side of things and necessitating some warmth. That said, the only thing we know about your system is the amp and speakers so would be most helpful to know what pre and source you’re using because all of this contributes to what you’re hearing. There could well be another source of what you’re hearing and trying to fix through cables when it could well be another component that could be the source of the issue. More info is always better in these situations, so please share if you want better/more well-informed recommendations here.