Best interconnects used for around $500 +?

As someone who goes into almost every cable A/B test skeptical that I will hear any differences, I usually end up convinced that I hear some differences only to be left wondering if it matters. Recently I borrowed the Audience  au24se XLRs and couldn't believe how veiled my system became. I looked at the terminals and the connections just to be sure there were no issues there and all seemed well. Left-Right was identical. Extremely disappointing compared to my Audioquest Columbia 2m balanced ICs.

I know you're asking about SEs and not XLRs, but I still believe this is a worthwhile data point whether it be related to build quality, design philosophy, etc. Disappointing is disappointing. When I compare expensive ICs I don't expect to hear that.

DNM HFTN IC cables run about $500.00 new and to my ears are very hard to beat at 4x their cost.

KLE Innovations gZero range, if you can find them.

Very hard to find and they go quickly

The gZero6 and up are excellent.

Regards