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.