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I have one U2 (3 more coming) running on an ORICO P10-U2 10 Port External USB HUB Ultra Mini USB HUB for Laptop & Desktop (10 Port HUB with Power Adapter) and I have yet to consistently hash above 1.5Gh/s. 

I have it overclocked (I thought) –set-device antminer:clock=x0981, using bfgminer and btcguild for my pool.  What is causing it to under perform?

Have also U2 running.

Have command:

 _{-G -S antminer:all --icarus-options 115200:1:1 --icarus-timing 3.0=100 --set-device=antminer:clock=x0981}

That works fine for me, with the x0981 they run after ~ 15 min. exactly at 2,0 GH/s

My tests with command  x0A81  to overclock to 2,2 GH/s work  with 3 USB-miner, with 4 USB or more they tilt. But at 2,0 GH/s  with  x0981  i can let work 6 sticks same time.

 
Edit:

• On BTC Guild- settings configure the worker for the USB Miner at difficulty 4.
• With 3-4 U2 set difficulty at BTC Guild- settings at 8.
• With 5 or more U2 set difficulty at BTC Guild- at 16.
• They have some minutes to arrive at good GH/s, first 1 - 5 minutes they run unstable

 
Edit 2:

Do you have a cooler? A fan? If you overclock, (2 GH/s or more) it is needet, so they run stable. Without cooler they often have 20 - 30 minutes stable, then the values ​​start to decline... under 2 GH/s

Thanks for the help. I will try these settings shortly, and yes i have an Arctic Breeze Mobile USB fan.

Still not getting to 2Gh/s could it be the usb hub?

schould be ok, because he have a Power Adapter   

 ??? ???

try connect U2 direct to computer or laptop to test if its the hub...

Check the temperature?

Got it working like it should!! Downloaded the newest bfgminer and created a bat file shown below

-u username -p  abc -s 30 -S opencl:noauto -S erupter:all -S antminer:all -S amu:all --set-device antminer:clock=x0981

hashing over 2 finally and accepting shares like crazy. Now if the other 3 will get here i'll be good to go. Thanks for the input

I have a few of these Antminers, here are my setting in the .bat file for bfgminer, I get a steady 2gh/s with this setting.

bfgminer.exe -S antminer:all --set-device antminer:clock=x0881