Looking for a speaker cable with a relaxed sound.

Straight Wire Crescendo 3's. That's what I have with my Focal Mezzo Utopia's. Look them up. Under priced for what they are.

Oh, you're running silver. Just get copper.

Canare 4s11 

+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.