Hi Enthyx
I saw your post on another thread mentioning that you reported things here. It looks like you have tried a fair number of solutions. Over the past few months I have compiled a list of possible solutions for these mouse/camera issues. Take a look through see if you haven't already tried anything.
(1) In the mouse software lower "Polling Rate" to 100 - 125 range.
(2) If you have Razer Synapse software check that the Razer "Stats" software is not enabled. Open Synapse - along top bar is "Stats". Open that - if enabled - disable "Data Tracking" in the Stat's settings.
(3) Try disabling Foreground FPS limiter on Menu > System > Advanced.
(4) If you have a Wacom device you might disable things there or temporarily uninstall the Wacom drivers to test.
(5) Enable the rawMouse CVar. Open a chat box then copy/paste this line. Ctrl + V will paste it.
/script SetCVar("rawMouseEnable", 1);
To check that the script worked go to the Wow folder > WTF - look for the Config file. Open with notepad. This should be at the bottom of CVar list:
SET rawMouseEnable "1" (0 - zero is off)
(If it doesn't help - then while rawMouse is still active toggle "Hardware Cursor" on or off)
(6) On Battle.net App under "Options" Go to Game Settings > General - scroll down then check that Hardware Acceleration is enabled.
(7) *(The settings below are a Windows 10 feature - they have proven to be problematic - you would want to make the changes to avoid other issues as well)
Navigate to the main Wow folder. Down near the bottom of the list are 3 Wow icons (W) icons. World of Warcraft Launcher, Wow and Wow-64.
Right click on the Wow-64 icon. Select "Properties" at bottom of list. Then select "Compatibility" tab along top of next pane.
At the bottom of that select (check) "Disable Fullscreen Optimization"
Then do the same on the World of Warcraft Launcher icon.
(8) Disable NVidia Share then close Geforce Experience