$1500 to spend...

Well, The gliders removed the drawback of the speakers, you liked the sound with the Brio, and now have a different amplifier to compare and with the option of tube rolling and provision of more power. Let us know the result, thanks.  

IMHO, your biggest bang for the buck upgrade would be room treatments.

Hi y’all just a quick update, my system has gone through some fun changes over the last 5 months:
In order - >

Herbie’s Gliders - significant soundstage and imaging improvement - kept constant for the last 5 months.

Rogue Sphinx v2 -> tried 4 sets of tubes, didn’t love anything - some fun moments but overall too much glare/grain with my speakers. And I couldn’t deal with the finicky nature of the tubes. Switched it out for a:

Yamaha A-S2100 -> *very* pretty, *very* detailed, a 3d soundstage approaching some of the tubes I tried. BUT lacking a bit of rhythm, a bit of engagement. So smooth and lush though. Was enjoying it but then came across a good deal on a:

Rega Elicit-R -> !!wow!! punchy, fun, engaging, exciting - brought the goosebump moments back. *slightest* grain and not as much detail compared with the Yamaha, so I tried a:

Synergistic Audio Orange Fuse in the Elicit-R, still breaking it in, but seems to have smoothed everything out. Going to swap in the old fuse for comparison this weekend.

Then I just added 2x Schumann Resonance Generators. - really increased the three-dimensionality and enveloping feel of the music. Very cool tweak.

So anyway - *really* loving the Elicit-R - just really satisfying to listen - really draws me into the music. Cheers all!!

Thanks for the feedback, glad to hear that things worked out for you.

Didn't mention your room ?
If acoustic treatments are a possibility, look into the ,Vicoustic Extreme bass corner panels.... excellent!!