For what it's worth, I went from good quality single-ended interconnects (e.g., Audience Au24 SX) to balanced (i.e., XLR) Transparent interconnects over the past couple of years and haven't looked back for a moment.
Whereas you've gone to Gen 6 Supers, I went with Gen 5 Ultra and MM2 (Gen 5 predecessor) Reference units. I had replaced interconnects one at a time between DAC and preamp, peramp and monoblock amps, the phono preamp to preamp, and then finalized with speaker cables. In each case it was like a veil was removed, mostly with interconnects as opposed to speaker cables.
As regarding the fact of making two simultaneous changes (single-ended to balanced vs upgrades in cable manufacturer), I can't say for sure of the ratio of improvement that can be attributed between the two changes, but a clear improvement was indeed gained. My experience also showed that time is needed to let cables settle in before stability can be achieved. With the improvements in clarity gained, I was able to experience first hand that subtle changes over the course of cables settling in and stabilizing are discernable.