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
@ghjuvanni,

I would recommend XLR’s from Audio Envy. You will find their cables deliver detail, transparency in spades. Ultra quiet and smooth sound. They come with money back guarantee.

https://audioenvy.com/product/monitor/onestain-53/
@ghjuvanni  I've been using / exposed to their top two tiers over three generations (including the current one). You may be able to get a used top tier short length from 2 generations ago at your budgeted price...but I'm guessing here, and it may be unlikely for 500. I can't speak to their other tiers as I do not have direct experience.

There are a number of cable threads in the forum that should address your needs. I recommend perusing via the search function. It may lead to some good options and options different from those already brought up.

A number of regular posters use SR in their systems. Perhaps they will chime in.  @millercarbon  often recommends older SR cabling. It may be helpful to reach out to him.
David ten has given you good advice on breaking in the new cable before a rash decision. I will say I am a fan of Audioquest, Nordost and Kimber ( in that order )
but I think it is certainly taste and very system dependent. 
I would recommend at least a DBS cable which is a patented method to keep the dialectric formed and some silver in the cable per your stated interest in detail.

johnny R at stated above is an Audioquest expert.

have fun, enjoy the music and your quest

jim