Please see my addon: "Camera Speed Adjuster" for on the fly in-game adjustments!

https://www.curseforge.com/wow/addons/cameraspeedadjuster

 

This addon will set the CVARs:

cameraYawMoveSpeed

cameraPitchMoveSpeed

 

to 20.

 

This addon is for slowing down the mouse movement when you have a high DPI mouse. I made the particular setting of 20 for pitch and yaw to work with a DPI of 12500 on a Corsair Dark Core RGB SE Pro, as a reference

It's my first addon so I didn't know how to make a LUA coded window to edit the pitch and yaw. 

 

This will make it so you can turn up your mouse DPI very high so it will track better if you have a newer mouse with high DPI. 

The addon will slow down the speed in game, but the high DPI will cause the tracking to be much better. Will improve accuracy and fluidity!

 

If you want to edit this yourself, you have to edit the "camerapitchyaw.lua" file with wordpad or similar. Change the number from 20 to something else.