Okay, now I have a little more time and I've sorted my thoughts out a little better.
With the H/K AVR 430 the EQ curve I had applied wasn't a night and day difference. It was subtle and you had to know what you were listening for in order to pick up on it. TLS's catch phrase of 'sins of omission are much easier to forgive than sins of commission' was my guide to putting in place a few adjustments as I saw fit based on what I could discern with a Rives Test CD 2.
Here's what it looked like. Notice that I didn't mess with the Q as that was outside my ability to measure. Also this was a starting point that gave me some desired results that I could measure and hear but overall with music it wasn't easy to pick up on.
Then after that got done I would adjust the gains on the subs however I saw fit based on the overall playback volume. It always sounded like the subs were lightly tethered wolves. The 12db/oct xo slope allowed them to make themselves conspicuous rather quickly once the playback volume went up. With the RX-V2600 the steeper slope curtails the range of the subs beyond the alignment that TLS provided ... or should I say that the steeper slope meets TLS's prescribed alignment? Anyway the range of the subs is narrowed.
So the slope in this case is a noticeable improvement.
Onto the EQ'ing: I have every confidence that YPAO is a more sophisticated tool that me ...
... and my Rives disc as measured with a rat shack meter. Any equalization improvement is very difficult to discern audibly because of the improvement made by the steeper slope. However I think I was able to appreciate better separation of lead and back up vocals probably due in part to the bass not muddying up the midrange and maybe due to the EQ'ing. I haven't done a lot (read: anything) beyond running the auto set up that one time.
Remember that Harman 'How to Listen' software? To me it demonstrated that while shifts in the FR curve are in fact identifiable they are still more subtle than getting better speakers.
I'm still listening to BR-1's.
... and I need to give Brothers in Arms a rest. It's like listening to test tones anymore.