gpu GPU Low % Usage ? Help

[SirDougue]

All of my game run a 15% GPU usage. and not more than that. 
i try so many thing to try to fix my Issue. Few Exemple down here.
1-Disable HPET
2- Set powersaving to Perfomance in every place possible like Nvidia Control panel
3- Set GPU 1080ti ass my main GPU even if he chose it automatically
4- Trying to overclocking GPU or other part like (CPU-RAM)
5- Update my driver to the most recent version
And much more ! 
I need tips or help. i saw someone getting the same issue and he fix it by Full Reboot is PC. but i dont want chose this option because i have so much stuff to keep and i wan't intall everything

PC-
Aorus 1080TI
Nvidia 1060 (i only use this GPU Dedicate to my stream to keep the performance max out of my 1080TI when i stream on twitch)
Z270 Asrock Fatality K6
4x8 DDR4 3200MAH (32G)
Intel I7 7700k
Window 10 Version 1909
NVME 500G Storage
HDD 1TO Backup save Storage

any idea or tips ? 
(More information)- Seen like only my CPu hit 40-60% on everygame. and sometime hit 70%!!

[Mateyyy]

Does taking out the 1060 change anything? And where do you get the 15% usage figure from?

[SirDougue]

3 minutes ago, Mateyyy said:

Does taking out the 1060 change anything? And where do you get the 15% usage figure from?

I never try to remove my 1060 Yet but can be a idea
i get the 15% on my Aorus Graphic card control . he show me 15% in GPU usage when i play on a game . 
show me the same thing on Task manager and Msi afterburner

 

[Mateyyy]

6 minutes ago, SirDougue said:

I never try to remove my 1060 Yet but can be a idea
i get the 15% on my Aorus Graphic card control . he show me 15% in GPU usage when i play on a game . 
show me the same thing on Task manager and Msi afterburner

Are you sure that the 15% reading is related to the 1080Ti? And do you feel like the in-game performance is also bad or is it just the usage reading that's low but performance is normal?

[SirDougue]

12 minutes ago, Mateyyy said:

Are you sure that the 15% reading is related to the 1080Ti? And do you feel like the in-game performance is also bad or is it just the usage reading that's low but performance is normal?

Yeah i got hight Stutering and massif FPS drop . and no i can tell you the 15% are related to the 1080Ti because i can watch both at the same time and the 1060 run at 0% because i dont use it at all . only for streaming 
There a tiny exemple of my current Usage 

[Mateyyy]

7 minutes ago, SirDougue said:

Yeah i got hight Stutering and massif FPS drop . and no i can tell you the 15% are related to the 1080Ti because i can watch both at the same time and the 1060 run at 0% because i dont use it at all . only for streaming 
There a tiny exemple of my current Usage 

Right, well again, try removing the 1060 and leaving just the 1080Ti in, and you could also try using DDU to remove the current graphics driver and install a fresh one off Nvidia's website just in case.