Thanks for all the input!
My room is 13'x13', however it is a loft with half walls on the sides. I mainly listen at moderate levels even when Cheryal is not home. Mainly vocals, jazz, pop, prog-rock, folk... I rarely listen to rock, and never loud rock with my speakers. I save that for the headphones

(and car, I have a Burmeister system in my car).
I mainly listen to vinyl and want accuracy, sound stage, imaging through the speakers. I usually play digital through headphones, which is the only time I let it fly, so to speak. The Bryston through the Abyss is just crazy!.
Three feet from back wall is not an issue. The KEFs are at least that.
Even though the amp is rated at 130 at 4 ohm, I think (they are a tad vague), T+A is very conservative, ultra wide band width (1 - 200,000), and High Voltage design, like all T+A. So definitely not a wimpy gutless amp to say the least.
I am using Kimber Kable TC-12 cable. It should be good there. That is about $800 - $1000 speaker cables. Not the best but actually cost more than the basic Maggie's

.