@roddyboy proof is in the pudding. Try two pairs of the suggested 12 gauge cables and bi-amp with them. Listen for a few weeks. Then swap back in your better CGR cables on the high-end or low-end amp, and compare first hand. Results can vary one person's system to the next.
If you truly cannot hear a difference within your system, you could keep the two pairs of lower cost 12 gauge and sell off the other pair of CGR cables to a willing buyer. Feel free to send a private message when you put those CGR cables up for sale :)
If you truly cannot hear a difference within your system, you could keep the two pairs of lower cost 12 gauge and sell off the other pair of CGR cables to a willing buyer. Feel free to send a private message when you put those CGR cables up for sale :)