How comes  you have so low HW rate?
  My ANTIMNERS are running at 2GHS @ diff 8. and i have about 150 HW to 1000 Accepted shares.
 What do i do wrong?
The  Antminers are  powered from SUB3:0 hub with 4 A output.
The hub is connected to the USB2.0 port on my PC, but i assume that  there is not so much data to transfer, so speed shouldn't be a problem.
 Miners are pretty well cooled to  about 35 C°
 What am i missing?