I ran through this same checklist 2 nights ago, and hyperthreading is active.  I did check off the boost option above it just to try something since I've tried everything else.  I think I've tried that before but can't be sure so I'm running latencymon after that was switched in the bios.  I have a feeling it's some usb thing bleeding the system.  All drivers are up to date.  Bios is updated.  Devices not in use are disabled.  The only thing I haven't tried is to remove the networking/internet.  But I need that active, it's required for my needs.  I've gone through all of the USB settings in device manager.  
 
	I am sad to say, there is no resolution that anyone can find.  Microsoft told me to reinstall Windows.  But I did that 5x before.  I've even reformatted my hard drive and reinstalled everything.  I guess I need to do that every 60 days.  This is such bullshit.