Amp For Sopras

They are extremely smooth, detailed and open.  They have huge power reserves but are light on their toes - very quick.  I heard zero top end aggressiveness while listening to the Michi which seems to be what you're trying to improve.

I'm not that familiar with your particular Bryston amp so you should try to listen for yourself in your home if possible.

I had the #8 V1 and it is smooth as silk and nothing is overdone. Unless you are cranking it way up, it spends most of its time in Class A mode. My guess is that Pass would be quite similar. 

If you are running digital, streamer, DAC and cabling can make brightness issues worse.

Solid state preferred but I might consider something mildly-tubed if there’s such a thing.

Slide this in to the mix and keep your Cubed.

Surprised the Bryston isn't working for you. I use a Bryston 6BSST with Focal Diablo Utopia Colour EVOs and they are a great match for me in my open family  room. I do have a challenging room, open to a kitchen and eating nook, where the only room correction I can use is Anthem Room Correction on an STR preamp. I also use a pair of subwoofers if that matters.

I've been looking at Coda for a while.

The Michi at 132 lbs is not a contender.