I've had XLO Reference 3 (both interconnect and single wire speaker cable)in my system since this morning.  I see you are getting Signature (better stuff!).  Did you also audition the Reference series?
Yesterday, a did a home demo of Shunyata Venom, Diamondback, and Hydra 4.  With everything I have read, I was expecting to love it all.  Not the case.  Especially with the Hydra power conditioner, each power cable changed the overall sound in non-subtle ways.  One day was not long enough to settle in and get used to the various combinations.  A/B comparisons (late at night) drove me crazy!  To my surprise, I actually prefered the less expensive Venom to the Diamondback in some ways.  It could just be my system, but I found the Diamondback tended to smooth things out a bit too much, especially in the upper registers.