the anker hub it says only 3 of the ports supply the 2.1a?
also im not real fond of my pluggable hub i just got.. same as the one you have.
it has some auto switching power thing and sometimes it just turns off and you have to push the button to turn it back on..

Those 3 ports are charging only ports, so not using them. Clearly getting pretty good amperage on the others so far to be running stable at 900mhz. HW error rate is consistently lower on the Anker than the Pluggable also, so I guess this is an indication the power is cleaner.