Seeking recommendations for DAC to amplifier balanced XLR cable


The amplifier is Musical Fidelity M6si and the new DAC is RME ADI-2 DAC FS, both great devices. At first I connected them with AQ Colorado 1m RCA. I happen to believe, however, that balanced cabling, which is possible between these two devices, has theoretical advantages over single-ended. I ordered Sommer Epilogue XLR cable from Germany, plugged it in yesterday and compared... Unfortunately AQ Colorado beats the newcomer. I have 2 choices: stay with AQ Colorado RCA (since it already plays great) or look for a better XLR cable. Any advice here is welcome! 
ghjuvanni
@tomic601 It would not be easy as balanced has 2 signal wires. At this point I don't believe it would make a difference, anyway. I feel it's time to go back to music and stop upgrading for a while :-) It all sounds wonderful now. Amplifier and DAC are great and I am down to just one interconnect: the balanced (Sommer Epilogue) XLR cable from the DAC to the amp. CD and Node 2i + disk w/ FLAC all go to the single DAC.
I have made neotech nemoi 1120 with silver aeco RCA's. They are better than siltech sq 18 and the audioquest angel i have used before. More details and better overal balance. At least 100 hours of burn in. You can make XLR cables yourself with some EIZZ screw type connectors. 

If you want them assembled, you could buy them as harmonic tech recta os at the cable company.
Canare Star Quad for around $70/pair at Blue Jean Cables.  EMI/RF rejection at reasonable price plus 30-day money back policy.

Or Van Damme 268-020 if you want silver plate OFC copper in the same price range.
Only if your components are differentially balanced will the use of XLR interconnects make a difference..   If you have d/b components, all XLR sound pretty much the same.