Maybe quality issues in this early revision? What's up with all of that noise on the USB supply and the inability to deliver full power at low input battery voltage? It worked well on the smaller sibling, you know, so… 
Stick with the known good and easily moddable Lii-100, comrades. I myself have plenty of 2+A 5V PSUs, including a vintage 4-port USB v1.1 hub fed with a 6V 2A linear “brick”.
Cheers ^:)