Looking for a speaker cable with a relaxed sound.

+1, noromance.
Look into Audio Envy SP-9 speaker cables. They use the OCC copper and I’m very confident that SP-9 would be a perfect match for your Focal’s and Luxman.

+2, noromance.

Silver cables tend to be bright.  Get some decent copper cables, and you should at least be headed in the right direction.  If they still sound a bit forward, I'd consider adding an absorbent ring around the tweeter, like felt and dense foam....they cost very little and can be very effective at reducing high frequency reflections.

Just get a 10 gauge pure copper multistrand wire with low capacitance and you are set.  There is no such thing as a 'relaxed sound' speaker wire.

cakyol
Yep. Just like the old Monster Cable.
And try some felt on the baffle around the tweeters.

Maybe your room needs a little bit of attention. Do you have a reflection point that needs to be dealt with?