I prefer a “slightly” warmer sound, and while system is not bright if it were a tad warmer I wouldn’t mind.
Given what you’re looking for I can’t recommend these AZ Satori shotgun bi-wire cables strongly enough. I’ve been using them for about 20 years and they’ve staved off all comers to date in their price range and above. Maybe just a shade of natural warmth with organic tone, refined treble, and excellent imaging and expansive 3D soundstage — transparent yet natural sounding is how I’d describe them. And at only $350, which is an insanely good deal, if they don’t work out you could likely turn around and sell them for a profit. Just another potential idea to try FWIW, and best of luck.