Yes, dividing it is not the best way to do it.
Here's what you do, you do not need to change your sensitivity for this:
Right click UserActionBindings key [0] and click Duplicate. Do this two times so you get two new keys.
Expand key 0, 1 and 2 and confirm that they are all identical (all should have the ActionName MoveForward etc).
For key 0 change:
ActionName = Turn
KeyBind1 - Keyname = MouseX
KeyBind1 - Keyname = None
For key 1 change:
ActionName = LookUp
KeyBind1 - Keyname = MouseY
KeyBind1 - Keyname = None
InputScale = -1.428571
Note that numbers in this file are localized to your locale, so use comma or period according to your settings.
In the end the content of the file should look like this:
Export it to cloud and you're good to go!