As for the power supply, the hub is having an external power cable and is said to deliver 1.5 A on 3 charging ports. Additionally, it is the only thing plugged into the USB port at this moment.
This isn´t enough for higher frequencies. What is your voltage setting? The potentiometer at the right bottom corner on the backside has a flat side. Turn it to about 3 o´clock. Maybe 2 or 1 o`clock and see if the hashrate is getting stable. Use a frequency setting of 50 MHz for the tests. If it´s a power issue you sould at least get it running with this settings and a current of 1.5 A.