Feel free to talk me off the ledge

OP,

Just a thought… “fatiguing” doesn’t usually come from speakers, although it can exacerbate it. It usually comes from the electronics in the form of high frequency hash and distortion. It takes a lot of experience to really put your finger on it… but fatigue is the sign. Your Rogue equipment is not known for it… so, I would look at your source. If it is supplying the high frequency problem then it’s going to come out the speakers. If your room is not heavily sonically dampened then that will make it worst.

Can you borrow a real high quality streamer or CD Player . Try some dampening material in the walls behind… carpet in front of speakers. I would verify this is not you problem before proceeding.

@kclone 

"Probably what, 75% to 85% of recordings are not "audiophile".  So that leaves us small percentage of stuff that truly sounds out this world on our systems."

This is the great (mostly unspoken) problem with high performance audio.

It also explains the often rather strange musical choices of some of our veteran reviewers.

As our equipment gets below a sufficiently low threshold of distortion, the realisation that the music sounds progressively worse becomes an impossible one to ignore.

@skyscraper 

"If you’re unmarried, find a wife quickly. She will undoubtedly end your developing addiction in short order once she hears about what this stuff costs."

I have an understanding and tolerant wife, but yes there are real world limits.

At least for most of us.

In any case, nowadays she's not the problem

It's actually getting harder and harder to justify buying yet more equipment to myself.

So anything I buy in future needs to be substantially better or more desirable than what I already have.

I’m with the others that aren’t fans of the Heresy.  I am a fan of the Paradigm Founders the OP mentioned 

Quit with the "best" memtality.......

Everything is different....there is no best.

If you think you hear things better in another set after a good 45 minute audition then run with that.

The audition should be a minimum 45 minutes 

Hi OP, something to consider is the sensitivity of new speakers you may like. Your Klipsch are 99dB sensitive which is unusually high. If the new speakers of interest are only 87dB which is typical, then to get the same SPL you would need to double the power into them 4 times!  And you don't have that kind of power.

The above fact may not be mentioned by the seller of the speakers you are smitten by.

Perhaps something to consider too is that a waveguide/horn with compression driver plays differently to a dome tweeter. By comparison a CD on a waveguide/horn produces, by comparison, unlimited dynamics and greatly reduced distortion. I'm sure you've been to a live concert and noticed that the PA speakers are not equipped with dome tweeters, and for a reason.

From what I can make out your CDs use titanium diaphragms which are known to be a little brash. Try and swap them out for aluminium or beryllium and while you're at it consider replacing the series caps in the midrange and tweeter circuits. There is lots of improvement to be gained there.

The 99dB sensitivity is set by the woofer and to achieve that something is sacrificed and that is the bottom octave, therefore a few subs will completely change the overall performance. If this suggestion is not an immediate 'no no' then read up on the multi-sub approach. Also room treatment, essential for any room makes a huge difference. Ignore those who state: "just hang a curtain and add a rug"  That's not treatment, that's decoration.

Good luck and remember Pink Floyd never played through dome tweeters!