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
@OP, 
You seem to be a glutton for punishment.😉

The Colorado's are fairly long in the tooth. I would consider moving to a more current interconnect.
I am getting a set of Mackenzie, soon.
I would PM John Rutan (Audioconnection) and get his opinion, before buying anything. He knows many brands, beyond the ones he sells and will give you the unvarnished truth.
Bob

plugged it in yesterday and compared

Is that a fair comparison? I'm assuming a fully run in, comfortable in your system cable   Versus   a tired, jet lagged, time zone confused, where the heck am I cold cable? 
@david_ten Perhaps not a fair comparison indeed. I don't quite believe in cable break-in, but I am going to give this newcomer a chance. I was just trying to listen to it but I had to switch it over to Colorado, the lack of clarity was so annoying. I think the not broken-in cable would be harsh. This one is not, it just misses detail. I doubt that this effect will improve with time.
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