Performance :: Huge Fps Drop On Games After Upgrading

I recently upgraded to Windows 10 because there are a handful of upcoming games that I am interested in that are only available from the Windows store (Gears of War, Killer Instinct, and Quantum Break), and I also want to take advantage of dx12 when games start to utilize it. I've read that some people have noticed a minor dip in fps after upgrading, but my experience was so bad I had no choice but to revert back to Windows 7 Ultimate.

Examples:

Rise of the Tomb Raider- Windows 7-max fps-62, min fps-43. Windows 10-max fps-44, min fps-31
Just Cause 3 Windows 7-max fps-54, min fps-30. Windows 10-a consistent 30 fps.
Project Cars Windows 7-max fps-118, min fps-88. Windows 10- max fps 88, min fps-73.
Mad Max Windows 7-max fps-111, min fps-88. Windows 10- a consistent 60 fps.

As you can see, these represent more than just a "slight drop" in framerate which I was willing to accept.

My PC :
i7 4790k 4 ghz cpu
gtx 980 ti x 2 SLI
32 gb ddr3
Asus Extreme Motherboard.