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
@david_ten No, I haven’t ordered anything yet. The listings of yesterday were for cables longer than I need, looking for 1m or less. I was even considering UpscaleAudio but that’s $840 :-(
But I’d like start explorations w/ this AZ cable @soix mentioned (and that I see consistently reviewed as great)
@soix @david_ten Update. Please read my original post to see what I had been trying to achieve. It turned out, the problem was not with the new cable but with output reference level setting on the RME ADI-2 DAC. The manual recommends +7dB setting for HiFi; it also informs that XLR is by 6dB louder. I did set +7dB and it was great for the RCA. However, balanced was not simply just louder, it was also distorted. Someone on a Polish audio forum, and at about the same time on the official RME forum (after long and heated discussions about voodoo, magic, illusions, etc.)  finally suggested adjusting the reference level correspondingly; I set it to +1dB so it is +7 again with the XLR boost. I didn't think about it myself not having prior experience with balanced connection; I thought that this +6dB is something specific to XLR, and that both the DAC and the amp will be in agreement about this higher level. Well, this is not so for the MF M6si!
Now with the +1dB setting the Sommer Epilogue XLR sounds fantastic! I have yet to compare it back to AQ Colorado RCA (with reference level back to +7dB). But the sound is already detailed, spacious, dynamic, not colored -- just as I wanted, so perhaps I shouldn't mess with this topic anymore :-)   I don't know if Acoustic Zen Silver Reference can beat my current sound appreciably. 
@ghjuvanni — Great detective work and congrats on finding the issue and on being happier about what you’re hearing.  I’d still say to give the Sommer some additional playing time to possibly show its full potential, but very glad to hear its already delivering what you were looking for.  This has to be especially gratifying after going through what you did.  Enjoy!
@soix Sound is terrific; listening to Ricardo Villalobos "Re: ECM". I find it interesting that on 2 forums (not this one) people attacked what I heard, and then attacked various "audiophile myths" and marketing that I am not even interested in, spoke about illusion, and more, before one guy (on the Polish forum) suggested the effective and simple solution :-)

https://forum.rme-audio.de/viewtopic.php?pid=150056

BTW, do you think that the AZ can still improve anything? Is it worth the effort/cost? I have doubts and "better is the enemy of good."