Bryston preamps

Im actually using a 14bsst now and going to the cubed version. There is some glare in the 7k region. That according to a free spectrum analyzer app. Maybe I should wait and see if the cubed Bryston tames it. I have acoustically treated my room with curtains , panels and tube traps.. Vinyl does not have as much harshness but I am upgrading to a Marantz as-10

So, what are your source components, speakers, and cables, and are you using any power conditioning?

Sorry SA-10 .

Marantz 8005 sacd player. PS audio P1000 power regenerator powering everything but the amp. OHM 5000 speakers with Canare 4s11 speaker wire. Pangaea and PS audio power cords and Pangea SE interconnects. Analog set up is a fully upgraded AS final tool TT with Graham 2.2 forearm and an Ortofon 2m Black cartridge and an Acoustech ph1 p phone preamp. I have the speaker cables 2 feet off the floor. All components isolated with cones or damping material. Dedicated AC line

Wow.  Frankly, you've now got $11,000 amps powering $7000 (or less) speakers.  It's absolutely worth seeing how your system sounds with the new amps after they've had 100+ hours to break in, but at the very least at this point you've got to explore the possibility of upgrading your speakers.  My extensive experience with a Bryston BP6 in my system is that it will neither create, nor mask, a glare in any area.  It's a virtual straight wire with gain, and since the BP6 shares very similar topology with the BP26 (as per James Tanner) I'd have to surmise going that direction will not bandaid your situation in any way.  Once you have your new amps broken in I'd suggest following up here.  I know there was a big change from a 2BSST to a 3BSST2 I had in my system in terms of refinement and more natural sounding treble, so you may well be on the right path.  But still, I can't help thinking those amps could deserve and reward you with better speakers down the road.   Anyway, keep us posted.