Howdy Usildraconis,
Double-check you are not running into the same issue with Razer Software, we have a known issue thread on this Here.
The Dxdiag also lists a series of TDR errors: LKD_0x141_Tdr:6_IMAGE_nvlddmkm.sys_Pascal, type 0
I would recommend making sure you completed a clean install of the latest Nvidia Driver. The goal of this step isn’t to update your driver but to complete a clean install to fix possible corruption. You can do this by downloading the latest driver Here. When you get to the Install Options section select: Custom (Advanced) → Next → Checkmark: Perform a clean installation and restart the system before retesting.
Thanks!