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
This is Sommer Epilogue:
https://shop.sommercable.com/en/Cable/HiFi-Home/NF-Phonokabel-Stereo-Paar-Epilogue-QuadCore-HighEnd-EPB1.html

Matthias Carstens, the designer of the RME ADI-2 DAC said on his forum:
XLR cabling has several benefits - no ground loops, better SNR, lower noise sensitivity. The quality of these cables does not matter much and they are not expensive, so go for them.

Balanced cables are designed to cancel out noise. This relatively inexpensive Sommer Epilogue in the XLR configuration sounds no worse than AQ Colorado in RCA. At this point I have doubts if messing up with cables is going to make any further improvement -- but, if I could try-before-buy, I am open to experimentation.
 
After 4 more weeks with Sommer Epilogue XLR we compared it to Audioquest Colorado RCA which I had been using previously. Please not that we are not comparing apples to apples because Sommer is balanced. Finding number 1: the two cables are pretty much exchangeable, it is very hard to tell the difference. But Sommer is around $100, while the AQ Colorado was $450, 50% off list $900. A total waste of money. Finding number 2: if really hard pressed, I'd prefer the Sommer XLR to the Colorado. This can mean, however, that XLR is preferable between RME ADI-2 DAC and MF M6si. 
If the XLR cable is between differentially balanced components, there is very little difference between any balanced cable... they are all great
... which suggests that spending any more than about $100 per pair is a waste of money. Possibly Mogami Gold would similarly be indistinguishable from the Sommer I am using 
The best way to know for you and your ears is DO the test and IF the less expensive stuff is the sonic equal, sell the others and move on