Finally found a space for the speakers I’ve been storing... and I don’t love them any more

Don’t overlook the Revel Performance 3 226Be.  Even more of that transparency and less bass bloom than the bigger 228Be. I presume you have subs to over the bottom octaves. 

mhsu, it is just as likely that it is the room you do not like and not the speakers. Move them temporarily to another room to listen before you ditch them. If they sound fine in another room you have a lot of work to do.

Thanks for all of the terrific feedback. Taking @douglas_schroeder @roxy54 and others' advice I did try swapping out components to see if it was an amplification preference.

I have done this exercise before, but it has been a while, so I brought the Revel bookshelf speakers into the other listening room to do some testing. (The Paradigms are too big for me to move by myself, so I haven't had a chance to do the converse yet.) The results somewhat surprised me.
It turns out Douglas et al were right on a number of counts:

First of all, though I did still prefer the character of the Revels, the differences were not as extreme and pronounced as I had recalled when matched up side-by-side with the same electronics.
Second, I also found that the Paradigms did sound much closer to what I wanted when paired with a different amplifier. I tried powering them with a Peachtree Audio Decco 65 and they presented a much more transparent sound with greater separation of instruments and more deliberate positioning in the soundstage. I had not tried this in the past since my receiver (an NAD T758) and the Peachtree integrated amp only deliver 60-65 wpc, whereas the Adcom supplies a hefty 300 wpc. Indeed, I would still want more power than the Peachtree can deliver, but the difference in the character of the sound was unmistakable. [I will also follow up with the Anthem receiver which is normally paired with the Revels, but there is a lot of plugging & unplugging that has to be done for that to happen!]

I think the other differences I heard between the Paradigms and Revels can be chalked up to what everyone else has mentioned -- much newer, well-designed speakers and room treatment.
I have already learned a lot and there are many opportunities to tinker and upgrade (and spend money). I think my next step will be to audition a few amplifiers before making a move. In a totally emotional and irrational way, I'd love to make the Paradigms work (and it feels like I can), just because I've wanted them to for so long, but there is clearly a world of options out there.

Hello,
All of the speaker suggestions are good. I have had the privilege of demoing the Revel line in my home. The interesting fact is I found they are very forgiving to untreated rooms especially the BE line. I started with the bookshelf speakers M126be and was blown away how good they sound. I do have two REL subs to help with the bass. That being said even the 228be speakers disappeared in my room. My room is 24’ x 14’ and they did create a lot of bass with a good 100w amp. I agree with the remark above to try the 226be or the 6 1/2” driver version to still get a true three way speaker. If $7k is out of the budget go with the M126be at $4k with subs. The Revel stands are $500. Since you have the Revel 106s you might have the correct stands to mount the bookshelf speakers too. You get 90% of the sound of the 226be at $3k less. The store in the Chicagoland area that let me demo them in my house is https://holmaudio.com/
they let you try before I buy. They also take trade ins so you can offset some of the cost. 

mhsu, superb outcome shaping up for you! You were wise to reproach mixing up the gear in order to learn that every system is discrete, and that amps, cables - all of it influences outcome, and speakers are not as determinative to the outcome as one might think. 

I recommend trying all practical combinations of gear because of the potential for an unexpected outcome. One simply does not know precisely how the system will shape up, and the only way to know is to build it. Assuming to know can cause you to miss a great outcome. Remember, all systems, regardless of the speakers, can be elevated many times. There is no practical limit to performance improvements. 

Another recommendation; prior to making a big move with speakers, consider not only which of the two you will keep, but consider whether an entirely different genre of speaker may be more exciting as a next adventure. i.e. Horn, Horn Hybrid, Panel, Panel Hybrid, Dynamic Hybrid, Line Array, Omnidirectional, Full Range, etc. All of these present an entirely different experience that none of the others can copy entirely. If you wish, there are vast differences from the prototypical dynamic speakers. 

I am reviewing now a speaker that has characteristics that I have not encountered previously, imo a new genre of speaker. The exploration of a new experience can be perceptually different/better.