I really like the sound characteristics of the Au24...ultra smooth midrange, esp for female vocals, relaxed, smooth presentation, treble without etch or glare, wide soundstage, etc.I would say a couple of things. I've found with two components that I actually liked the music more with the RCAs than with the XLRs. They were the same cable, naturally, but both had the same effect of losing focus with the XLRs. YMMV, of course.
You obviously are a big fan of the AU24. I found them to be exactly as you describe, but within an hour I was really bored with the music. The Venustas have similar qualities--excellent bass as well--but in contrast to the AU24, I find the music to be enveloping and utterly engaging. My suggestion would be to pick up a used pair of Venustas, leave them in your system for 3-4 days (they may disappoint at first), and then go back to the AU24. Then you'll know which you prefer, and you could end up sticking with what you already have.
Best of luck!