Better to use the modded version of BFG Miner here for U1's: https://www.dropbox.com/s/c7movpxohewides/bfgminer-npw-antminerV3.7z

I run four right now with the regular CP2102 drivers listed in the U1 manual which means you don't need to overwrite the drivers and plug in each U1 everytime you start up.

Far simpler imo.  Give it a try.  Just uninstall the U1's on your device manager and replug the U1's to install the regular drivers.  After that run BFG Miner with the command '--set-device antiminer:clock=xHEX' where 'HEX' would be the speed you wish to set.  The default is 0781 but if you look in the manual it goes quite high.  I'm running mine at 0881 with no problems.

Hope this helps.