If you can do 8’ cables I’d consider these used Acoustic Zen Satori cables with their jumpers (from The Cable Company) along with this Silver Ref II XLR interconnect that’d be about the same price as the Straightwire cables. I’ve had both the Satori shotgun biwire and single versions and the difference is slight hence my recommendation for single wire with jumpers, and I also have the Silver Ref II and these should do just what you’re looking for and all should be a substantial upgrade to your current cables. AZ cables have a fluid used market so if I’m a liar you can easily sell them for little/no loss. Best of luck.
https://www.usaudiomart.com/details/650101365-acoustic-zen-satori-8-speaker-cables-spades/
https://www.thecableco.com/cables/satori-jumper-cables-set.html
https://www.usaudiomart.com/details/650086300-acoustic-zen-silver-reference-ii-xlr-1m/