I am sorry to hear that have had issues with USB 3.0 drivers.
I have noticed you are using driver version 188.8.131.52 that appears to be customized driver from Asus.
Please try the latest USB 3.0 drivers for Windows 7 here:
Make sure to download this file on your desktop screen and execute it from there. Do not run installation from USB flash drive.
I have the same problem on my wife's computer. Her motherboard is an ASUS Maximus VI Hero (Z87). At least once a day, her computer will wake from sleep, and powercfg -lastwake indicates it is the Intel(R) USB eXtensible Host Controller that causes the wake. Similarly to JustStan, the only devices armed to wake the computer are the mouse, keyboard, and Ethernet. I have the latest drivers installed (184.108.40.206).
My BIOS is up to date, as well as all other drivers (chipset, graphics, Windows Update, Intel Ethernet). This is a problem, as we are trying to save power, yet we wake up every day to a computer that's wide awake, multiple times a day.