I listened to the Crack for about an hour last night with no issues. After rereading the manual I see the (+/-) 10% tolerance so maybe I'm worried for nothing. Still, I would love it if one of the pros gave me the thumbs up.
One mire bit of info: voltage readings on the small board were good during initial test. I did not recheck the small board after large board installed.
Source: Lumin D2 with SBooster power supply, 2tb SSD attached to Lumin, Pre: Moreplay, Amp: Bryston 2bSST, Speakers: Joseph Audio RM22XL. Setup in large, well treated dedicated listening space.