I was going to mention your USB headers but I thought that would have been the first thing you checked out, I guess I should have said something after all. Once you refill the mini pump I think you will find it performing the way it should be, now that you know which barb is the inlet.
I still find the pump kind of small to handle the Boreas, I could see it working with another pump to help increase the flow. Let me know how it works, my barbs have not arrived yet we got hit with another major storm yesterday so I doubt they will be here today.