"does the cheap USB running between between the SSD and into the Bryston really matter?"
I'm also running Ayre QB-9 TWENTY, and noticed a very significant improvement when switching out from a Belkin USB cable to Cardas Clear. Not very pricey, they go for around $200. Not sure if it has an effect, but it is known that Ayre internal wiring is Cardas sourced. Hope this helps.